DIMETHOXY-4-METHALLYLOXYPHENETHYLAMINE)

 

SYNTHESIS: To a solution of 5.8 g of homosyringonitrile (see under ESCALINE for its preparation) in 50 mL of acetone containing 100 mg of decyltriethylammonium iodide there was added 7.8 mL methallyl chloride followed by 6.9 g of finely powdered anhydrous K2CO3. The suspension was kept at reflux by a heating mantle, with effective stirring. After 6 h an additional 4.0 mL of methallyl chloride was added, and the refluxing was continued for an additional 36 h. The solvent and excess methallyl chloride was removed under vacuum and the residue was added to 400 mL H2O. This solution was extracted with 3x75 mL CH2Cl2. The extracts were pooled, washed with 2x50 mL 5% NaOH, and the solvent removed to provide a dark brown oil. This was distilled at 120-130 deg C at 0.4 mm/Hg to provide 6.1 g of 3,5-dimethoxy-4-methyallyloxyphenylacetonitrile as a lemon-colored viscous oil. Anal. (C14H17NO3) C,H.

 

A suspension of 4.2 g LAH in 160 mL anhydrous THF under He was stirred, cooled to 0 deg C, and treated with 2.95 ml of 100% H2SO4 added dropwise. This was followed by the addition of 6.0 g of 3,5-dimethoxy-4-methallyloxy-phenylacetonitrile dissolved in 10 mL anhydrous THF, at a slow rate with vigorous stirring. The reaction mixture was held at reflux on the steam bath for 0.5 h, brought back to room temperature, and the excess hydride destroyed with IPA. Sufficient 15% NaOH was added to convert the formed solids to a loose, granular texture, and the entire mixture filtered and washed with THF. The filtrate and washings were pooled, the solvent removed under vacuum, and the residue added to 500 mL dilute HCl. This solution was washed with 2x50 mL CH2Cl2, made basic with aqueous NaOH, and extracted with 3x75 mL CH2Cl2. The extracts were pooled, the solvent removed under vacuum, and the residual pale amber oil distilled at 120-130 deg C at 0.3 mm/Hg to provide 1.5 g of a white oil. This was dissolved in 8.0 mL of IPA and neutralized with 25 drops of concentrated HCl. The addition of 40 ml of anhydrous Et2O with stirring produced, after a few moments delay, a spontaneous crystallization of 3,5-dimethoxy-4-methallyloxyphenethylamine hydrochloride (MAL) as fine white needles. After standing overnight these were removed by filtration, washed with an IPA/Et2O mixture, then with Et2O, and allowed to air dry to constant weight. The product weighed 1.1 g, and had a mp of 153-154 deg C. Anal. (C14H22ClNO3) C,H.

 

DOSAGE: 40 - 65 mg.

 

DURATION: 12 - 16 h.

 

QUALITATIVE COMMENTS: (with 45 mg) Too much overload. I am sur-rounded with unreality. I do not choose to repeat the experiment.

 

(with 45 mg) I am basically favorably impressed. I believe the initial discomfort would be alleviated by taking two 30 milligram doses separated by an hour.

 

(with 45 mg) Much too much too much. There are shades of what might become amnesia. I am losing immediate contact. I will not repeat.

 

(with 50 mg) A good level. I found myself totally caught up in the visual theater. Although I had trouble sleeping, I would willingly repeat the experiment at the same level.

 

(with 60 mg) Extremely restless. Am very impressed with all the activity. But if I repeated it would be at a lower dose.

 

(with 60 mg) Friendly territory. There is much kaleidoscopic `neon' colors. Eyes closed very active. Eyes open there is considerable visual distortions seen in melted wax. Faces are distorted (friendly) but the sinister is not far away.

 

(with 65 mg) Completely involved Q good psychedelic state Q visual entertainment with alternation (i.e., depth and movement) at the

retinal level Q detail in watercolors. Later in the experience (the 8 hour point) easy childhood memory recall.

 

(with 65 mg) Beautiful. To a +2 by the 1st hr and continued climbing. Intense +3 within 2 hrs. Quite strong body. Diuretic. Fantasy, imagery, erotic. Way up, good connections between parts of self. Slight slowing of pulse in 7th to 8th hour. Excellent solid sleep with strong, clear, balancing dreams. But not until after 12 hrs.

 

EXTENSIONS AND COMMENTARY: This testimony can be accurately described as a mixed bag!

 

This base, MAL, lies as a hybrid of two other compounds, AL and CPM. It is an olefin (as is AL) which means that it has a place of unsaturation in its structure. And it is an isostere of CPM which means that the carbon atoms are all in the same location, but just the connecting electrons (called the chemical bonds) are in different places. Actually there is yet a third compound in this same picture, called PROPYNYL. And yet, although all of them have extremely close structural similarities, there are such great differences in action that one does not dare to generalize. CPM leads largely to fantasy, MAL largely to visual imagery, AL is twice as potent as either of these but it doesn't show either effect, and PROPYNYL is almost without any action at all.

 

Speaking of generalization, I am glad that there are always exceptions. Some years ago, I had a most difficult experience with a strain of marijuana that was known by the name of DRED. The only word that I can use to describe my response to it is to say that I felt I had been poisoned. From this I warned myself to beware (and to believe in) whatever common name a drug might have been given. Fortunately, MAL did not live up to its name (at least for me), although some of the experimental subjects might disagree!

 

One additional compound was suggested by these parallels. Each of these three drugs can be viewed as having a negative something hanging out a-ways from the molecular center. With AL and MAL, this is the olefin double bond. With CPM this is a very strained three-member ring. What about an oxygen? The reaction between homosyringonitrile and methoxyethyl chloride produced the precursor to such a product (3,5-dimethoxy-4-(2-methoxyethoxy)-phenethylamine) but the yield was so bad that the project was abandoned. This same grouping has successfully been put into the 4-position of the sulfur-containing analog, and the result (2C-T-13) has proved to be quite a potent and interesting material. Maybe someday hang a sulfur atom out there at the end of that chain.

 

The name methallylescaline actually is completely unsound. There is no union of a methallyl with an escaline. What is really there is not an escaline at all, but rather a mescaline with a 2-propene attached to the methyl of the methoxy on the 4-position. There is no way of naming the thing in that manner, so the only logical solution is to take off the methyl entirely, and then put the methallyl on in its place. The name of this would then be 4-methylallyldesmethylmescaline. That would have received the abbreviation MAD which would have been even more difficult to deal with. MAL is preferable.     

 

 

 

#100 MDA; 3,4-METHYLENEDIOXYAMPHETAMINE

 

SYNTHESIS: (from piperonal) To a solution of 15.0 g piperonal in 80 mL glacial acetic acid there was added 15 mL nitroethane followed by 10 g cyclohexylamine. The mixture was held at steam-bath temperature for 6 h, diluted with 10 mL H2O, seeded with a crystal of product, and cooled overnight at 10 deg C. The bright yellow crystals were removed by filtration, and air dried to yield 10.7 g of 1-(3,4-methylenedioxyphenyl)-2-nitropropene with a mp of 93-94 deg C. This was raised to 97-98 deg C by recrystallization from acetic acid. The more conventional efforts of nitrostyrene synthesis using an excess of nitroethane as a solvent and anhydrous ammonium acetate as the base, gives impure product in very poor yields. The nitrostyrene has been successfully made from the components in cold MeOH, with aqueous NaOH as the base.

 

A suspension of 20 g LAH in 250 mL anhydrous THF was placed under an inert atmosphere and stirred magnetically. There was added, dropwise, 18 g of 1-(3,4-methylenedioxyphenyl)-2-nitropropene in solution in THF and the reaction mixture was maintained at reflux for 36 h. After being brought back to room temperature, the excess hydride was destroyed with 15 mL IPA, followed by 15 mL of 15% NaOH. An additional 50 mL H2O was added to complete the conversion of the aluminum salts to a loose, white, easily filtered solid. This was removed by filtration, and the filter cake washed with additional THF. The combined filtrate and washes were stripped of solvent under vacuum, and the residue dissolved in dilute H2SO4. Washing with 3x75 mL CH2Cl2 removed much of the color, and the aqueous phase was made basic and reextracted with 3x100 mL CH2Cl2. Removal of the solvent yielded 13.0 g of a yellow-colored oil that was distilled. The fraction boiling at 80-90 deg C at 0.2 mm weighed 10.2 g and was water-white. It was dissolved in 60 mL of IPA, neutralization with concentrated HCl, and diluted with 120 mL of anhydrous Et2O which produced a lasting turbidity. Crystals formed spontaneously which were removed by filtration, washed with Et2O, and air dried to provide 10.4 g of 3,4-methylenedioxyamphetamine hydrochloride (MDA) with a mp of 187-188 deg C.

 

(from 3,4-methylenedioxyphenylacetone) To a solution of 32.5 g anhydrous ammonium acetate in 120 mL MeOH, there was added 7.12 g 3,4-methylenedioxyphenylacetone (see under MDMA for its preparation) followed by 2.0 g sodium cyanoborohydride. The resulting yellow solution was vigorously stirred, and concentrated HCl was added periodically to keep the pH of the reaction mixture between 6 and 7 as determined by external damp universal pH paper. After several days, undissolved solids remained in the reaction mixture and no more acid was required. The reaction mixture was added to 600 mL of dilute HCl, and this was washed with 3x100 mL CH2Cl2. The combined washes were back-extracted with a small amount of dilute HCl, the aqueous phases combined, and made basic with 25% NaOH. This was then extracted with 3x100 mL CH2Cl2, these extracts combined, and the solvent removed under vacuum to provide 3.8 g of a red-colored residue. This was distilled at 80-90 deg C at 0.2 mm/Hg to provide 2.2 g of an absolutely water-white oil. There was no obvious formation of a carbonate salt when exposed to air. This was dissolved in 15 mL IPA, neutralized with 25 drops of concentrated HCl, and diluted with 30 mL anhydrous Et2O. Slowly there was the deposition of white crystals of 3,4-methylenedioxyamphetamine hydrochloride (MDA) which weighed 2.2 g and had a mp of 187-188 deg C. The preparation of the formamide (a precursor to MDMA) and the acetamide (a precursor to MDE) are described under those entries.

 

DOSAGE: 80 - 160 mg.

 

DURATION: 8 - 12 h.

 

QUALITATIVE COMMENTS: (with 100 mg) The coming on was gradual and pleasant, taking from an hour to an hour and one half to do so. The trip was euphoric and intense despite my having been naturally depleted from a working day and having started so late. One thing that impressed itself upon me was the feeling I got of seeing the play of events, of what I thought to be the significance of certain people coming into my life, and why my `dance', like everyone else's, is unique. I saw that every encounter or event is a potential for growth, and an opportunity for me to realize my completeness at where I am, here and now, not at some future where I must lug the pieces of the past for a final assemblage `there.' I was reminded of living the moment to its fullest and I felt that seeing this was indicative that I was on the right track.

 

(with 128 mg) Forty-five minutes after the second dosage, when I was seated in a room by myself, not smoking, and where there was no possible source of smoke rings, an abundance of curling gray smoke rings was readily observed in the environment whenever a relaxed approach to subjective observation was used. Visually these had complete reality and it seemed quite unneccessary to test their properties because it was surely known and fully appreciated that the source of the visual phenomena could not be external to the body. When I concentrated my attention on the details of the curling gray forms by trying to note how they would be affected by passing a finger through their apparent field, they melted away. Then, when I relaxed again, the smoke rings were there. I was as certain that they were really there as I am now sure that my head is on top of my body.

 

(with 140 mg) I vomited quite abruptly, and then everything was OK. I had been drinking probably excessively the last two days, and maybe the body needed to unpoison itself. The tactile sense is beautiful, but there seems to be some numbness as well, and I feel that nothing erotic would be do-able. Intimacy, yes, but no performance I'm pretty sure. I saw the experience start drifting away only four hours into it, and I was sad to see it go. It was an all around delightful day.

 

(with 200 mg, 2x100 mg spaced 1 h) RThe first portion was apparent at one-half hour. There was microscopic nausea shortly after the second portion was taken, and in an hour there was a complete +++ developed. The relaxation was extreme. And there seemed to be time distortion, in that time seemed to pass slowly. There was a occasional LSD-like moment of profoundness, but by and large it was a simple intoxication with most things seeming quite hilarious. The intoxication was also quite extreme. Some food was tried later in the experiment, and it tasted good, but there was absolutely no appetite. None at all.

 

(with 60 mg of the "R" isomer) There was a light and not too gentle development of a somewhat brittle wound-up state, a + or even a ++. Chills, and I had to get under an electric blanket to be comfortable. The effects smoothed out at the fourth hour, when things started to return to baseline. Not too entertaining.

 

(with 100 mg of the "R" isomer) Rapid development from the 40 minute point to an hour and a quarter; largely a pleasant intoxication, but there is something serious there too. No great insights, and not too much interference with the day's goings-on. Completely clear at the 8 hour point.

 

(with 120 mg of the "R" isomer) This is a stoning intoxicant. I would not choose to drive, because of possible judgement problems, but my handwriting seems to be clear and normal. The mental excitement dropped rapidly but I was aware of physical residues for several additional hours.

 

(with 80 mg of the "S" isomer) A very thin, light threshold, which is quite delightful. I am quite willing to push this a bit higher.

 

(with 120 mg of the "S" isomer) Perhaps to a one +. Very light, and very much like MDMA, but perhaps shorter lived. I am pretty much baseline in three hours.

 

(with 160 mg of the "S" isomer) The development is very rapid, and there is both muscular tremor and some nausea. The physicals are quite bothersome. With eyes closed, there are no effects noticeable, but with eyes open, things are quite bright and sparkling. The muscular spasms persist, and there is considerable teeth clenching. I feel that the mental is not worth the physical.

 

EXTENSIONS AND COMMENTARY: There are about twenty different synthetic routes in the literature for the preparation of MDA. Many start with piperonal, and employ it to make methylenedioxyphenylacetone or a methylenedioxydihydro-cinnamic acid amide instead of the nitrostyrene. The phenylacetone can be reduced in several ways other than the cyanoborohydride method mentioned here, and the amide can be rearranged directly to MDA. And there are additional methods for the reduction of the nitrostyrene that use no lithium aluminum hydride. Also there are procedures that have safrole or isosafrole as starting points. There is even one in the underground literature that starts with sassafras root bark. In fact, it is because safrole is one of the ten essential oils that MDA can humorously be referred to as one of the Ten Essential Amphetamines. See the comments under TMA.

 

There is a broad and checkered history concerning the use and abuse of MDA, and it is not the case that all the use was medical and all the abuse was social. One of the compulsive drives of both the military and the intelligence groups, just after World War II, was to discover and develop chemical agents which might serve as "truth serums" or as incapacitating agents. These government agencies considered the area of the psychedelics to be a fertile field for searching. The giving of relatively unexplored drugs in a cavalier manner to knowing and unknowing subjects was commonplace. There was one case in 1953, involving MDA and a psychiatric patient named Howard Blauer that proved fatal. The army had contracted with several physicians at the New York State Psychiatric Institute to explore new chemicals from the Edgewood Arsenal and one of these, with a chemical warfare code number of EA-1298, was MDA. The last and lethal injection into Blauer was an intravenous dose of 500 milligrams.

 

There have been a number of medical explorations. Under the code SKF-5 (and trade name of Amphedoxamine) it was explored as an anorexic agent. It has been found promising in the treatment of psychoneurotic depression. There are several medical reports, and one book (Claudio Naranjo's The Healing Journey), that describe its values in psychotherapy.

 

MDA was also one of the major drugs that was being popularly used in the late 1960's when the psychedelic concept exploded on the public scene. MDA was called the "hug-drug" and was said to stand for Mellow Drug of America. There was no difficulty in obtaining unending quantities of it, as it was available as a research chemical from several scientific supply houses (as were mescaline and LSD) and was sold inexpensively under its chemical name.

 

A few experimental trials with the pure optical isomers show a consistency with all the other psychedelic compounds that have been studied in their separated forms, the higher potency with the "R" isomer. The less potent "S" isomer seemed to be more peaceful and MDMA-like at lower doses, but there were worrisome toxic signs at higher levels.

 

The structure of MDA can be viewed as an aromatic ring (the 3,4-methylenedioxyphenyl ring) with a three carbon chain sticking out from it. The amine group is on the second of the three carbon atoms. The isomers, with the amine function moved to the first of these carbons atoms (a benzylamine) and with the amine function moved to the third (furthest out atom) of these carbon atoms (a (n)-propylamine), are known and both have been assayed.

 

The benzylamine counterpart (as if one were to move the amine function from the beta-carbon to the alpha-carbon of the three carbon chain of the amphetamine molecule) is alpha-ethyl-3,4-methylenedioxybenzylamine or 1-amino-1-(3,4-methylenedioxyphenyl)propane, ALPHA. The hydrochloride salt has a mp of 199-201 deg C. At low threshold levels (10 milligram area) there were eyes-closed "dreams" with some body tingling. The compound was not anorexic at any dose (up to 140 milligrams) and was reported to produce a pleasant, positive feeling. It is very short-lived (about 3 hours). The N-methyl homologue is alpha-ethyl-N-methyl-3,4-methylenedioxybenzylamine or 1-methylamino-1-(3,4-methylenedioxy-phenyl)propane, M-ALPHA. It is similar in action, but is perhaps twice as potent (a plus one or plus two dose is 60 milligrams) and of twice the duration.

 

The (n)-propylamine counterpart (as if one were to move the amine function the other direction, from the beta-carbon to the gamma-carbon of the three carbon chain of the amphetamine molecule) is gamma-3,4-methylenedioxyphenylpropylamine or 1-amino-3-(3,4-methylenedioxyphenyl)propane, GAMMA. The hydrochloride salt has a mp of 204-205 deg C. At oral levels of 200 milligrams there was some physical ill-at-ease, possible time distortion, and a feeling of being keenly aware of one's surroundings. The duration of effects was 4 hrs.

 

The phenethylamine that corresponds to MDA (removing the alpha-methyl group) is 3,4-methylenedioxyphenethylamine, or homopiperonylamine, or MDPEA, or simply H in the vocabulary of the Muni-Metro world. This compound is an entry in its own rights. The adding of another carbon atom to the alpha-methyl group of MDA gives compound J, and leads to the rest of the Muni-Metro series (K, L etc). All of this is explained under METHYL-J. The bending of this alpha-methyl group back to the aromatic ring gives an aminoindane, and with J one gets an aminotetralin. Both compounds react in animal discrimination studies identically to MDMA, and they appear to be free of neurochemical toxicity.

 

The two possible homologues, with either one or two methyl groups on the methylene carbon of the methylenedioxy group of MDA, are also known. The ethylidene compound (the acetaldehyde addition to the catechol group) has been encoded as EDA, and the acetone (isopropylidine addition to the catechol group) is called IDA. In animal discrimination studies, and in in vitro neurotransmitter studies, they both seem to be of decreased potency. EDA is down two to three-fold from MDA, and IDA is down by a factor of two to three-fold again. Human trials of up to 150 milligrams of the hydrochloride salt of EDA producd at best a threshold light-headedness. IDA remains untested as of the present time. The homologue of MDA (actually of MDMA) with the added carbon atom in, rather than on, the methylenedioxy ring, is a separate entry; see MDMC.

 

A final isomer to be mentioned is a positional isomer. The

3,4-methylene-dioxy group could be at the 2,3-position of the amphetamine skeleton, giving 2,3-methylenedioxyamphetamine, or ORTHO-MDA. It appears to be a stimulant rather than another MDA. At 50 milligrams, one person was awake and alert all night, but reported no MDA-like effects.     

 

 

 

#101 MDAL; N-ALLYL-MDA; 3,4-METHYLENEDIOXY-N- ALLYLAMPHETAMINE

 

SYNTHESIS: A total of about 20 mL allylamine was introduced under the surface of 20 mL concentrated HCl, and the mixture stripped of volatiles under vacuum The resulting 24 g of wet material did not yield any crystals with either acetone or Et2O. This was dissolved in 75 mL MeOH, treated with 4.45 g 3,4-methylenedioxy-phenylacetone (see under MDMA for its preparation), and finally with 1.1 g sodium cyanoborohydride. Concentrated HCl was added as needed over the course of 5 days to keep the pH constant at about 6. The reaction mixture was then added to a large amount of H2O, acidified with HCl, and extracted with 3x100 mL CH2Cl2. The aqueous phase was made basic with 25% NaOH, and extracted with 3x100 mL CH2Cl2. Evaporation of the solvent from these extracts yielded 3.6 g of an amber oil which, on distillation at 90-95 deg C at 0.2 mm/Hg, yielded 2.6 g of an off-white oil. This was dissolved in 10 mL IPA, neutralized with about 25 drops of concentrated HCl, and the resulting clear but viscous solution was diluted with Et2O until crystals formed. These were removed by filtration, washed with IPA/Et2O (1:1), then with Et2O, and air dried to constant weight. There was thus obtained 2.5 g of 3,4-methylenedioxy-N-allylamphetamine hydrochloride (MDAL) with a mp of 174-176 deg C and a proton NMR spectrum that showed that the allyl group was intact. Anal. (C13H18ClNO2) N.

 

DOSAGE: greater than 180 mg.

 

DURATION: unknown.

 

EXTENSIONS AND COMMENTARY: Here is another inactive probe, like MDPR, that could possibly serve as a primer to LSD. The three carbon chain on the nitrogen seen with MDPR is almost identical to the three carbon chain on the nitrogen atom of MDAL. And yet, where an "inactive" level of 180 milligrams of MDPR is a rather fantastic enhancer of LSD action, the same weight of this compound not only does not enhance, but actually seems to somewhat antagonize the action of LSD. All this difference from just a couple of hydrogen atoms. Identical carbon atoms, identical oxygen atoms, and an identical nitrogen atom. And all in identical places. Simply C13H18ClNO2 rather than C13H20ClNO2.

 

So, apparently, almost identical is not good enough!

 

#102 MDBU; N-BUTYL-MDA; 3,4-METHYLENEDIOXY-N-BUTYLAMPHETAMINE

 

SYNTHESIS: A total of 30 mL butylamine was introduced under the surface of 33 mL concentrated HCl, and the mixture stripped of volatiles under vacuum. The resulting glassy solid was dissolved in 160 mL MeOH and treated with 7.2 g 3,4-methylenedioxyphenylacetone (see under MDMA for its preparation). To this there was added 50% NaOH dropwise until the pH was at about 6 as determined by the use of external dampened universal pH paper. The solution was vigorously stirred and 2.8 g sodium cyanoborohydride was added. Concentrated HCl was added as needed, to keep the pH constant at about 6. The addition required about two days, during which time the reaction mixture first became quite cottage-cheese like, and then finally thinned out again. All was dumped into 1 L H2O acidified with HCl, and extracted with 3x100 mL CH2Cl2. These extracts were combined, extracted with 2x100 mL dilute H2SO4, which was combined with the aqueous fraction above. This latter mixture was made basic with 25% NaOH, and extracted with 3x150 mL CH2Cl2. Evaporation of the solvent yielded 4.0 g of an amber oil which, on distillation at 90-100 deg C at 0.15 mm/Hg, yielded 3.2 g of a white clear oil. This was dissolved in 20 mL IPA, neutralized with 30 drops of concentrated HCl, and the spontaneously formed crystals were diluted with sufficient anhydrous Et2O to allow easy filtration. After Et2O washing and air drying, there was obtained 2.8 g of 3,4-methylenedioxy-N-butylamphetamine hydrochloride (MDBU) as white crystals with a mp of 200-200.5 deg C. Anal. (C14H22ClNO2) N.

 

DOSAGE: greater than 40 mg.

 

DURATION: unknown.

 

EXTENSIONS AND COMMENTARY: Straight chain homologues on the nitrogen atom of MDA longer than two carbons are probably not active. This butyl compound provoked no interest, and although the longer chain counterparts were made by the general sodium cyanoborohydride method (see under MDBZ), they were not tasted. All mouse assays that compared this homologous series showed a consistent decrease in action (anesthetic potency and motor activity) as the alkyl chain on the nitrogen atoms was lengthened.

 

This synthetic procedure, using the hydrochloride salt of the amine and sodium cyanoborohydride in methanol, seems to be quite general for ketone compounds related to 3,4-methylenedioxyphenylacetone. Not only were most of the MD-group of compounds discussed here made in this manner, but the use of phenylacetone (phenyl-2-propanone, P-2-P) itself appears to be equally effective. The reaction of butylamine hydrochloride in methanol, with phenyl-2-propanone and sodium cyanoborohydride at pH of 6, after distillation at 70-75 deg C at 0.3 mm/Hg, produced N-butylamphetamine hydrochloride (23.4 g from 16.3 g P-2-P). And, in the same manner with ethylamine hydrochloride there was produced N-ethylamphetamine (22.4 g from 22.1 g P-2-P) and with methylamine hydrochloride there was produced N-methylamphetamine hydrochloride (24.6 g from 26.8 g P-2-P). The reaction with simple ammonia (as ammonium acetate) gives consistently poor yields in these reactions.     

 

 

 

#103 MDBZ; N-BENZYL-MDA; 3,4-METHYLENEDIOXY-N-BENZYLAMPHETAMINE

 

SYNTHESIS: To a suspension of 18.6 g benzylamine hydrochloride in 50 mL warm MeOH there was added 2.4 g of 3,4-methylenedioxyphenylacetone (see under MDMA for its preparation) followed by 1.0 g sodium cyanoborohydride. Concentrated HCl in MeOH was added over several days as required to maintain the pH at about 6 as determined with external, dampened universal paper. When the demand for acid ceased, the reaction mixture was added to 400 mL H2O and made strongly acidic with an excess of HCl. This was extracted with 3x150 mL CH2Cl2 (these extracts must be saved as they contain the product) and the residual aqueous phase made basic with 25% NaOH and again extracted with 4x100 mL CH2Cl2. Removal of the solvent under vacuum and distillation of the 8.7 g pale yellow residue at slightly reduced pressure provided a colorless oil that was pure, recovered benzylamine. It was best characterized as its HCl salt (2 g in 10 mL IPA neutralized with about 25 drops concentrated HCl, and dilution with anhydrous Et2O gave beautiful white crystals, mp 267-268 deg C). The saved CH2Cl2 fractions above were extracted with 3x100 mL dillute H2SO4. These pooled extracts were back-washed once with CH2Cl2, made basic with 25% NaOH, and extracted with 3x50 mL CH2Cl2. The solvent was removed from the pooled extracts under vacuum, leaving a residue of about 0.5 g of an amber oil. This was dissolved in 10 mL IPA, neutralized with concentrated HCl (about 5 drops) and diluted with 80 mL anhydrous Et2O. After a few min, 3,4-methylenedioxy-N-benzylamphetamine hydrochloride (MDBZ) began to appear as a fine white crystalline product. After removal by filtration, Et2O washing and air drying, this weighed 0.55 g, and had a mp of 170-171 deg C with prior shrinking at 165 deg C. Anal. (C17H20ClNO2) N.

 

DOSAGE: greater than 150 mg.

 

DURATION: unknown.

 

EXTENSIONS AND COMMENTARY: The benzyl group is a good ally in the synthetic world of the organic chemist, in that it can be easily removed by catalytic hydrogenation. This is a trick often used to protect (for a step or series of steps) a position on the molecule, and allowing it to become free and available at a later part in a synthetic scheme. In pharmacology, however, it is often a disappointment. With most centrally active alkaloids, there is a two-carbon separation between the weak base that is called the aromatic ring, and the strong base that is called the nitrogen. This is what makes phenethylamines what they are. The phen- is the aromatic ring (this is a shortened form of prefix phenyl which is a word which came, in turn, from the simplest aromatic alcohol, phenol); the ethyl is the two carbon chain, and the amine is the basic nitrogen. If one carbon is removed, one has a benzylamine, and it is usually identified with an entirely different pharmacology, or is most often simply not active. A vivid example is the narcotic drug, Fentanyl. The replacement of the phenethyl group, attached to the nitrogen atom with a benzyl group, virtually eliminates its analgesic potency.

 

Here too, there appears to be little if any activity in the N-benzyl analogue of MDA. A number of other variations had been synthesized, and none of them ever put into clinical trial. With many of them there was an ongoing problem in the separation of the starting amine from the product amine. Sometimes the difference in boiling points could serve, and sometimes their relative polarities could be exploited. Sometimes, ion-pair extraction would work wonders. But occasionally, nothing really worked well, and the final product had to be purified by careful crystallization.

 

Several additional N-homologues and analogues of MDA are noted here. The highest alkyl group on the nitrogen of MDA to give a compound that had been assayed, was the straight-chain butyl homologue, MDBU. Six other N-alkyls were made, or attempted. Isobutylamine hydrochloride and 3,4-methylenedioxyphenylacetone were reduced with sodium cyanoborohydride in methanol to give 3,4-methylenedioxy-N-(i)-butylamphetamine boiling at 95-105 deg C at 0.15 mm/Hg and giving a hydrochloride salt (MDIB) with a mp of 179-180 deg C. Anal. (C14H22ClNO2) N. The reduction with sodium cyanoborohydride of a mixture of (t)-butylamine hydrochloride and 3,4-methylenedioxyphenylacetone in methanol produced 3,4-methylenedioxy-N-(t)-butylamphetamine (MDTB) but the yield was miniscule. The amyl analog was similarly prepared from (n)-amylamine hydrochloride and 3,4-methylenedioxyphenylacetone in methanol to give 3,4-methylenedioxy-N-amylamphetamine which distilled at 110-120 deg C at 0.2 mm/Hg and formed a hydrochloride salt (MDAM) with a mp of 164-166 deg C. Anal. (C15H24ClNO2) N. A similar reaction with (n)-hexylamine hydrochloride and 3,4-methylenedioxyphenylacetone in methanol, with sodium cyanoborohydride, produced after acidification with dilute sulfuric acid copious white crystals that were water and ether insoluble, but soluble in methylene chloride! This sulfate salt in methylene chloride was extracted with aqueous sodium hydroxide and the remaining organic solvent removed to give a residue that distilled at 110-115 deg C at 0.2 mm/Hg to give 3,4-methylenedioxy-N-(n)-hexylamphetamine which, as the hydrochloride salt (MDHE) had a mp of 188-189 deg C. Anal. (C16H26ClNO2) N. An attempt to make the 4-amino-heptane analogue from the primary amine, 3,4-methylenedioxyphenylacetone, and sodiumcyanoborohydride in methanol seemed to progress smoothly, but none of the desired product 3,4-methylenedioxy-N-(4-heptyl)-amphetamine could be isolated. This base has been named MDSE, with a SE for septyl rather than HE for heptyl, to resolve any ambiguities about the use of HE for hexyl. In retrospect, it had been assumed that the sulfate salt would have extracted into methylene chloride, and the extraordinary partitioning of the sulfate salt of MDHE mentioned above makes it likely that the sulfate salt of MDSE went down the sink with the organic extracts of the sulfuric acid acidified crude product. Next time maybe ether as a solvent, or citric acid as an acid. With (n)-octylamine hydrochloride and 3,4-methylenedioxyphenylacetone in methanol, with sodium cyanoborohydride, there was obtained 3,4-methylenedioxy-N-(n)-octylamphetamine as a water-insoluble, ether-insoluble sulfate salt. This salt was, however, easily soluble in methylene chloride, and with base washing of this solution, removal of the solvent, and distillation of the residue (130-135 deg C at 0.2 mm/Hg) there was eventually gotten a fine hydrochloride salt (MDOC) as white crystals with a mp of 206-208 deg C. Anal. (C18H30ClNO2) N.

 

As to N,N-dialkylhomologues of MDA, the N,N-dimethyl has been separately entered in the recipe for MDDM. Two efforts were made to prepare the N,N-diethyl homologue of MDA. The reasonable approach of reducing a mixture of diethylamine hydrochloride and 3,4-methylenedioxyphenylacetone in methanol with sodium cyanoborohydride was hopelessly slow and gave little product. The reversal of the functionality was successful. Treatment of MDA (as the amine) and an excess of acetaldehyde (as the carbonyl source) with sodium borohydride in a cooled acidic medium gave, after acid-base workup, a fluid oil that distilled at 85-90 deg C at 0.15 mm/Hg and was converted in isopropanol with concentrated hydrochloric acid to 3,4-methylenedioxy-N,N-diethylamphetamine (MDDE) with a mp of 177-178 deg C. Anal. (C14H22ClNO2) N.

 

And two weird N-substituted things were made. Aminoacetonitrile sulfate and 3,4-methylenedioxyphenylacetone were reduced in methanol with sodium cyanoborohydride to form 3,4-methylenedioxy-N-cyanomethylamphetamine which distilled at about 160 deg C at 0.3 mm/Hg and formed a hydrochloride salt (MDCM) with a mp of 156-158 deg C after recrystallization from boiling isopropanol. Anal. (C12H15ClN2O2) N. During the synthesis of MDCM, there appeared to have been generated appreciable ammonia, and the distillation provided a fore-run that contained MDA. The desired product had an acceptable NMR, with the N-cyanomethylene protons as a singlet at 4.38 ppm. A solution of t-butylhydrazine hydrochloride and 3,4-methylenedioxyphenylacetone in methanol was reduced with sodium cyanoborohydride and gave, after acid-basing and distillation at 95-105 deg C at 0.10 mm/Hg, a viscous amber oil which was neutralized in isopropanol with concentrated hydrochloric acid to provide 3,4-methylenedioxy-N-(t)-butylaminoamphetamine hydrochloride (MDBA) with a mp of 220-222 deg C with decomposition. Anal. (C14H23ClN2O2); N: calcd, 9.77; found, 10.67, 10.84.   

 

 

 

#104 MDCPM; CYCLOPROPYLMETHYL-MDA;

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