Книга I: история любви 18
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| #166 2T-MMDA-3a; 3,4-METHYLENEDIOXY-2-METHYLTHIOAMPHETAMINE SYNTHESIS: A solution of 30 g piperonal in 25 mL cyclohexylamine was brought to a boil on a hot plate, until there was no more water apparently being evolved. The resulting melt was distilled giving 45 g of N-cyclohexyl-3,4-methylenedioxybenzylideneimine boiling at 114-135 deg C at 0.2 mm/Hg as a light yellow oil. In 400 mL anhydrous Et2O there was dissolved 40.3 g N-cyclohexyl-3,4-methylenedioxybenzylidenimine and 30 mL N,N,N',N'-tetramethylethylenediamine (TMEDA). This solution was put under an inert atmosphere, and with good stirring brought to -78 deg C with an external dry ice/acetone bath, which produced a light white crystalline precipitate. There was then added 120 mL of 1.55 M butyllithium, which produced an immediate darkening and a dissolving of the fine precipitate. After 10 min stirring, there was added 20 mL of dimethyl disulfide. The color immediately vanished and there was the formation of a white precipitate. The temperature was allowed to return to ice bath temperature, and then all volatiles were removed under vacuum. The residue was poured into 500 mL H2O and acidified with HCl. After heating for 1 h on the steam bath, the reaction mixture was cooled, producing a gummy solid that was shown to be a complex mixture by TLC. But there was a single fluorescent spot that was the product aldehyde and it was pursued. Extraction with 3x75 mL CH2Cl2 gave, after pooling and stripping of the solvent, a residue which was extracted with four separate passes, each with 75 mL boiling hexane. The deposited crystals from each were separated, and all recrystallized from boiling MeOH to give 3.3 g of 3,4-methylenedioxy-2-(methylthio)benzaldehyde, with a mp of 77-80 deg C. To a solution of 3.0 g 3,4-methylenedioxy-2-(methylthio)benzaldehyde in 25 mL IPA there was added 2 mL nitroethane, 0.11 mL ethylenediamine and 0.1 mL acetic acid. This was held at reflux temperature for 18 h, and the solvents removed under vacuum. The residue showed a total of eight spots on TLC analysis, extending from the origin to the spot of the product nitrostyrene itself. Trituration of this residue under 25 mL MeOH gave a crude nitrostyrene which was, after separation, recrystallized from 20 mL of boiling MeOH. The final isolation of 1-(3,4-methylenedioxy-2-methylthiophenyl)-2-nitropropene gave 0.5 g of a product that had a mp of 94-95 deg C. The mixed mp with the nitrostyrene from piperonal (mp 97-98 deg C) was soundly depressed (mp 67-79 deg C). A solution of AH was prepared by the treatment of a solution of 0.5 g LAH in 10 mL THF, at 0 deg C and under He, with 0.32 mL 100% H2SO4. A solution of 0.45 g 1-(3,4-methylenedioxy-2-methylthiophenyl)-2-nitropropene in 10 mL THF was added dropwise, and the stirring was continued for 1 h. After a brief period at reflux, the reaction mixture was returned to room temperature, and the excess hydride destroyed by the addition of IPA. The salts were converted to a filterable mass by the addition of 5% NaOH, and after filtering and washing with IPA, the combined filtrate and washings were stripped of solvent under vacuum. The residue was dissolved in dilute H2SO4 which was washed with 3x75 mL CH2Cl2. After alkalinification with 25% aqueous NaOH, the product was extracted with 2x75 mL CH2Cl2. The extracts were pooled, and the solvent removed under vacuum. Distillation of the residue gave a fraction that boiled at 137-150 deg C at 0.3 mm/Hg and weighed 0.3 g. This was dissolved in 1.6 mL IPA, neutralized with 6 drops of concentrated HCl, warmed to effect complete solution, and diluted with 4 mL of anhydrous Et2O. The formed crystals were collected by filtration, and after Et2O washing and air drying to constant weight, gave 0.3 g 3,4-methylenedioxy-2-methylthioamphetamine hydrochloride (2T-MMDA-3a). DOSAGE: greater than 12 mg. DURATION: unknown. EXTENSIONS AND COMMENTARY: And visions of sugar-plums danced through their heads. There are many trisubstituted amphetamine analogues that have been documented with varying degrees of activity. There are six TMA's and if one were to systematically make every possible thio-analogue of each of these, there would be a total of sixteen thio-analogues of the TMA. Let's go for it, said I to myself. Let's get the 16 thio analogues in hand. That is where the action's at. But hold on a minute. Each and every MMDA isomer has, by definition, three possible thio analogues, so there are eighteen more possible thio compounds just with them. Sure, let's make them all! It will be an unprecedented coup for students of structure-activity relationships. Let's whip out some 34 compounds, and test them all, and maybe we will begin to understand just why those which are active are, indeed, active. And maybe not. Anyway, this was the most manic of all manic programs ever, involving thio-analogues. And it was totally compelling. Another synthetic clue stemmed from the fact that vanillin also formed the cyclic carbonate with sodium thiocyanate and it could, in principle, be brought around in time to 3-methoxy-5,4-methylenethiooxyamphetamine, or 5T-MMDA. That made two of the magic analogues, and only some 32 to go. What a marvelous task for a graduate student. (What a horribly dull task for a graduate student.) But in any case there was no graduate student, and this appeared to be the end of the line. Some day, let's make all these possibilities. A magnificent tour-de-force, but at the present time, not worth the effort. Other directions are more exciting and more appealing. A last note of simple humor. One of the compounds used in this preparation was N,N,N',N'-tetramethylethylenediamine, which has been abbreviated TMEDA. There is a pattern, within any active inner clique of research chemists intently pursuing a goal, to begin condensing complex comcepts into deceptively simple terms. We "MOM-ed the hydroxy group of the T-BOC-ed amine." I have recently heard the above tetramethyl monster referred to in the chemist's jargon as a pronounced, rather than a spelled out, word. It sounds very much like "tomato" spoken by a native of the Bronx. #167 4T-MMDA-2; 6-(2-AMINOPROPYL)-5-METHOXY-1,3-BENZOXATHIOL; 2-METHOXY-4,5-METHYLENETHIOOXYAMPHETAMINE SYNTHESIS: To a well-stirred solution of 120 g thiourea in 800 mL 2N HCL, there was added a solution of 100 g benzoquinone in 500 mL acetic acid over the course of 15 min. Stirring was continued for an additional 0.5 h at room temperature, and then the reaction mixture was heated on the steam bath for 1 h. With cooling in ice water, a heavy crop of crystals separated. These were removed by filtration and air dried to provide 90.1 g of 5-hydroxy-1,3-benzoxathiol-2-one (2-mercaptohydroquinone cyclic carbonate ester) with a melting point of 170.5-172.5 deg C. To a suspension of 100 g finely powdered anhydrous K2CO3 in 400 mL acetone containing 50 g methyl iodide there was added 41 g 5-hydroxy-1,3-benzoxathiol-2-one, and the mixture stirred overnight at room temperature. The solids were removed by filtration, and the solvent removed under vacuum. The residue was distilled to give a fraction subliming over as a solid at an oven temperature of 110 deg C at 0.1 mm/Hg. This was a yellowish solid, weighing 27.4 g and having a mp of 66-72 deg C. Recrystallization from MeOH gave 5-methoxy-1,3-benzoxathiol-2-one as a white solid with a mp of 75.5-76.5 deg C. To a solution of 30 g 85% KOH in 75 mL warm H2O, there was added an equal volume of warm MeOH followed by 16 g 5-methoxy-1,3-benzoxathiol-2-one, and the mixture was held under reflux conditions for 2 h. After cooling to room temperature, the mix was acidified with HCl and extracted with 2x100 mL CH2Cl2. Removal of the solvent from the pooled extracts gave a yellow oil that crystallized on standing. The product, 2-mercapto-4-methoxyphenol, weighed 14 g and had a mp of 56-57 deg C. A solution of 10 g 2-mercapto-4-methoxyphenol in 100 mL MEK was added over the course of 1 h to a vigorously stirred suspension of 25 g finely powdered anhydrous K2CO3 in 200 mL MEK that contained 14 g methylene bromide. The reflux was maintained for 48 h. After cooling, the mixture was freed of solids by filtration and the filter cake washed with 50 mL additional MEK. The combined washes and filtrate were stripped of solvent under vacuum, and the product distilled to give 3.3 g of 5-methoxy-1,3-benzoxathiol as a yellowing oil that had a bp of 110-120 deg C at 1.7 mm/Hg. There was considerable residue in the pot, which was discarded. The NMR spectrum was excellent, with the methylene protons a two-hydrogen singlet at 5.6 ppm. To a mixture of 3.2 g POCl3 and 2.8 g N-methylformanilide that had been heated briefly on the steam bath (to the formation of a deep claret color) there was added 2.3 g 5-methoxy-1,3-benzoxathiol, and steam bath heating was continued for an additional 5 min. The reaction mixture was poured into 100 mL H2O, and after a few minutes stirring, the insolubles changed to a loose solid. This was collected by filtration, H2O washed and, after sucking as dry as possible, recrystallized from 30 mL boiling MeOH. This provided 1.9 g of 6-formyl-5-methoxy-1,3-benzoxathiol as brownish needles that melted at 119-120 deg C. A solution of 1.5 g 6-formyl-5-methoxy-1,3-benzoxathiol in 50 mL nitroethane was treated with 0.3 g anhydrous ammonium acetate and heated on the steam bath for 5 h. Removal of the solvent under vacuum gave a residue that crystallized. This was recrystallized from 110 mL boiling EtOH providing, after fil-tering and air drying, 1.3 g 5-methoxy-6-(2-nitro-1-propenyl)-1,3-benzoxathiol as San Francisco Giants-orange-colored crystals. A solution of AH was prepared by the treatment of a solution of 1.3 g LAH in 10 mL THF, at 0 deg C and under He, with 0.8 mL 100% H2SO4. A solution of 1.1 g of 5-methoxy-6-(2-nitro-1-propenyl)-1,3-benzoxathiol in 25 mL THF was added dropwise, and the stirring was continued for 1 h. After a brief period at reflux, the reaction mixture was returned to room temperature, and the excess hydride destroyed by the addition of IPA. The salts were converted to a filterable mass by the addition of 5% NaOH and, after filtering and washing with IPA, the combined filtrate and washings were stripped of solvent under vacuum. The residue was dissolved in dilute H2SO4 which was washed with 3x75 mL CH2Cl2 and then, after being made basic with 25% NaOH, the product was extracted with 2x75 mL CH2Cl2. The extracts were pooled, and the solvent removed under vacuum. Distillation of the residue gave a fraction that boiled at 140-155 deg C at 0.3 mm/Hg which weighed 0.7 g. This was dissolved in 4 mL IPA, neutralized with 14 drops of concentrated HCl, heated to effect complete solution, then diluted with 10 mL of anhydrous Et2O. The white crystals that formed were removed, Et2O washed, and air dried to give 0.6 g 6-(2-aminopropyl)-5-methoxy-1,3-benzoxathiol hydrochloride (4T-MMDA-2). DOSAGE: greater than 25 mg. DURATION: unknown. QUALITATIVE COMMENTS: (with 25 mg) At three hours after having taken the material, I felt that there might have been a little exhilaration. And maybe a hint of tremor and of teeth clench. Perhaps this is a threshold dose. EXTENSIONS AND COMMENTARY: There is no logical way to try to guess where the active level of this might be. In a comparison of 4-oxy with 4-thio- and with 4-alkyl (as, for example, TMA-2, PARA-DOT and DOM) the analogue with the sulfur atom lies intermediate in potency between the oxygen atom and the carbon atom. Then, perhaps, 4T-MMDA-2 should be somewhat more potent than MMDA-2. Which is where the trials have gone to, and the absence of effects therefore declares that line of reasoning invalid. What else could be used for clues? The whole benzofuran project, which had the same cyclic nature, was without activity. They had a carbon where the sulfur was of 4T-MMDA- 2, so, by that reckoning, this compound should be even less active. Maybe that is the formula to follow. The bottom line is inescapable. None of these extrapolations can hold a candle to the only experiment that can give believable findings, the actual trial of a new compound in man. The positional isomer of the heterocyclic carbonate used here is also known. Instead of using benzoquinone as a starting material with thiourea as the sulfur source (giving the 1,4- oxygen orientation), one can start with resorcinol in reaction with ammonium thiocyanate as the sulfur source (in the presence of copper sulfate) and get the positional isomer with a 1,3- oxygen orientation. This material (also known as thioxolone, or tioxolone, or 6-hydroxy-1,3-benzoxathiol-2-one, and which is commercially available) should follow the same chemistry shown here for the 5-hydroxy analogue, and give 5T-MMDA-2 (5-(2-aminopropyl)-6-methoxy-1,3-benzoxathiole or 2-methoxy-5,4-methylenethiooxyamphetamine) as a final product. I would guess, based on the findings that compare 5-TOM with DOM, that this would be a relatively low-potency compound. At least it should be an easy one to make! #168 TMPEA; 2,4,5-TRIMETHOXYPHENETHYLAMINE SYNTHESIS: To a solution of 39.2 g 2,4,5-trimethoxybenzaldehyde in 160 mL nitromethane there was added 7.0 g anhydrous ammonium acetate, and the mixture was heated on the steam bath for 2 h. The excesssolvent/reagent was removed under vacuum, leaving a deeply colored residue that spontaneously crystallized. This was mechanically removed and triturated under 60 mL cold MeOH. Filtration, washing with cold MeOH and air drying, gave 49.3 g of bright orange crystals. Trial recrystallizations from EtOAc gave a mp of 132-133 deg C; from CH3CN, 130.5-131.5 deg C. The entire product was recrystallized from 1.1 L boiling IPA to provide, after filtration, IPA washing, and air drying, 34.5 g of beta-nitro-2,4,5-trimethoxystyrene as yum-yum orange crystals with a mp of 132-133 deg C. Literature values are usual one-degree ranges, anywhere in the area of 127-130 deg C. To a suspension of 30 g powdered LAH in 800 mL of well stirred and refluxing anhydrous THF there was added a solution of 34.9 g beta-nitro-2,4,5-trimethoxystyrene in 200 mL anhydrous THF. The mixture was maintained at reflux for an additional 36 h, cooled, and the excess hydride activity destroyed by the addition of 30 mL H2O followed by 30 mL 15% NaOH, and finally with another 90 mL H2O. The solids were removed by filtration, washed with THF, and the pooled mother liquor and washings stripped of solvent under vacuum. The residue was dissolved in CH2Cl2, washed with both 5% NaOH and then H2O, removing much of the color. It was then extracted with 3x75 mL N HCl. The pooled red-colored acid extracts were washed with CH2Cl2, made basic with 25% NaOH, and extracted with 3x75 mL CH2Cl2. Removal of the solvent gave some 25 g of residue which was dissolved in 100 mL IPA and neutralized with concentrated HCl. The crystalline mass that formed was diluted with an equal volume of Et2O, and the solids removed by filtration. Washing with cold IPA, followed by Et2O and air drying, gave 17.7 g of 2,4,5-trimethoxyphenethylamine hydrochloride (TMPEA) as a white product. The reported melting point was 187-188 deg C. DOSAGE: greater than 300 mg. DURATION: unknown. QUALITATIVE COMMENTS: (with less than 300 mg) Since it was not easy, however, to judge the extent of a 'Rausch'-action from experiments on animals, some injections of beta-2,4,5-trimethoxyphenethylamine were administered to the author, and finally a control test was carried out with an equal quantity of mescaline. The action of both these substances in these experiments agreed only to a limited extent with the effects described for mescaline by, for example, Beringer. It must be remembered, however, in this connection, that the quantities used by Beringer were larger than the doses administered in these experiments. Nevertheless, it may be concluded that the pharmacological action of beta-2,4,5-trimethoxyphenethylamine agrees to a large extent with that of mescaline. However, the new compound had more unpleasant secondary effects (nausea) and did not bring about the euphoristic state caused by mescaline. (with 300 mg) Under double blind conditions, I was unable to distinguish this from a placebo. Both were without any of the changes described after the ingestion of psychotomimetic drugs. (with 200 mg, followed after 45 minutes, with 100 mg mescaline) RThe normally modest effects known to be due to mescaline alone at this level, were strongly potentiated with the earlier taking of 2,4,5-TMPEA. The effects were stronger as well as longer lived. EXTENSIONS AND COMMENTARY: The code letters used for this drug are not as ambiguous as they might seem at first glance. A large number of the 2-carbon homologues are given names based on the code for the 3-carbon compound. On that basis, this should be 2C-TMA-2, since it is the 2-carbon counterpart of TMA-2. But since the first of the trimethoxyphenethylamines already had a trivial name, mescaline, the code TMPEA was unassigned. So, here is the logical place to use it. There have been just two reports published of self-experimentation with TMPEA, and these comments are taken from them. The first is presented here, word for word, as it was originally published (this was in 1931). It leaves much to be desired. The administration was by injection (intramuscular injection?). The dose was not given, but it was less than those reported by Beringer in his studies with mescaline, and this latter experimenter's published levels were all between 300 and 500 milligrams. What can one conclude from all this? Only that TMPEA apparently did not measure up to mescaline in his comparisons. The second, reported some 40 years later, is not really contradictory. Here the TMPEA was administered orally, and the subject surrounded himself with a battery of psychological tests. This might allow statistics to provide an aura of validity to the observations. But the comments are pretty self-explanatory. The drug was not active in its own right, but when employed preliminary to mescaline, greatly enhanced the effects of the latter. This is an area of research that deserves more attention. The simple compound that results from the stripping of all three of the O-methyl groups from TMPEA is the extremely potent neurotoxin, 6-hydroxydopamine. When it is ad-ministered to an otherwise intact experimental animal, it produces sympathectomy, effectively destroying the sympathetic nervous system. And some of the methyl groups of TMPEA are known to be stripped off through the normal metabolic processes that occur in the liver. There are many fascinating psychedelics that have a signature of methoxyl groups para to one-another. It is known that they, too, can lose a methyl group or two. It would be intriguing to see if there was some biochemical overlap between the metabolism of some of these centrally active drugs and the metabolic fate of 6-hydroxydopamine. But in a test animal, of course, rather than in man. |
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