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#60 DMPEA

3,4-DIMETHOXYPHENETHYLAMINE


SYNTHESIS: A solution of 33 g 3,4-dimethoxybenzaldehyde in 140 mL acetic acid was treated with 23 mL nitromethane and 12.5 g anhydrous ammonium acetate, and heated on the steam bath for 45 min. To this there was slowly added, with good stirring, 300 mL H2O, and the resulting solids were removed by filtration. The product was finely ground under a small amount of MeOH, filtered again, and air dried to give 13.5 g 3,4-dimethoxy-beta-nitrostyrene with a mp of 142-143 °C.

To a stirred suspension of 12.0 g LAH in 500 mL anhydrous Et2O that was at a gentle reflux and under an inert atmosphere, there was added 11.45 g 3,4-dimethoxy-beta-nitrostyrene by leaching it from a thimble in a modified Soxhlet condenser. The addition took 2 h and the refluxing was maintained for another 16 h. After cool-ing to room temperature, the excess hydride was destroyed by the cautious addition of 500 mL 1.5 N H2SO4. The phases were separated, and to the aqueous phase there was added 250 g potassium sodium tartrate. The pH was brought to >9, and the clear solution was extracted with 3x100 mL CH2Cl2. Remo-val of the solvent from the combined extracts under vacuum gave 5.2 g of a pale yellow oil. This was dissolved in 300 mL anhydrous Et2O and saturated with anhydrous HCl gas, giving 5.0 g of a slightly sticky off-white solid. This was recrystallized from 75 mL of boiling CH3CN to give 3.3 g 3,4-dimethoxyphenethylamine hydrochloride (DMPEA) as beautiful white crystals.

DOSAGE: greater than 1000 mg.

DURATION: unknown.

QUALITATIVE COMMENTS: (with 500 mg) Nothing.

(with 1000 mg) Nothing.

(with 10 mg i.v.) RNothing.

(with 1000 mg of 3,4-dimethoxyphenylacetic acid, a major human metabolite of DMPEA) RNothing.

(with 500 mg of N-acetyl-3,4-dimethoxyphenethylamine, a major human metabolite of DMPEA) RNothing.

EXTENSIONS AND COMMENTARY: Why all the interest? Why keep pursuing a compound that is so obviously without activity? Or a metabolite that is also without activity? The answer is that these are totally fascinating compounds just because they have no activity! By the way, in this instance, I actually made up most of the quotations. I am not sure that the subjects actually said, "Nothing," but they did report that there were no effects. In my own experiments, my notes record the phrase, "No effects whatsoever."

A little background: one of the transmitter heavyweights in the brain is dopamine. Dopamine is called dopamine because it is an amine that comes from an amino acid that is 3,4-dihydroxyphenylalanine and this, in German, is Di-Oxo-Phenyl-Alanine, or DOPA. The levo-optical (or L-) isomer of DOPA has rather cutely been called the punch-drunk Spanish matador, or El Dopa. But that is not part of the story.

The story is really about the "Pink Spot of Schizophrenia." Many years ago, an observation was made in a biochemical laboratory on the East Coast that stirred up a rolling controversy. It had been found that if the urines of schizophrenic patients (sloppily called "schizophrenic urines") were extracted in such and such a way, and the extracts chromatographed, a pink spot would develop at a particular place on the chromatogram. Well, if this proved to be true with urines of a sick population, and were this proved to be different from the urines of a healthy population, it would constitute an objective diagnosis of schizophrenia. A simple chemical test to confirm a pathology that had defied all efforts to achieve consensus amongst the psychiatrists of the world.

The literature was suddenly filled with dozens of papers. Researcher A confirmed that the pink spot was found with schizophrenics, and not with normal controls. Researcher B found the pink spot in all urines, regardless of pathology. Researcher C found it in no urines at all. Researcher D argued that it was a factor from the hospital diet. Researcher E found that the pink spot reflected the time of day that the urine sample was collected. Researcher F drew a conclusion about where truth might lie by tallying the number of papers that supported argument A, B, C, D, or E.

The only confirmable fact that endured was that the pink spot was due to DMPEA. So a bright spotlight was directed towards its possible role in mental illness. And this expressed itself in the simple question: would it produce schizophrenia in a normal subject? No. And in a way I am comforted that that did not evolve into a simple litmus test for a schizophrenic diagnosis. There are so many cultural, political, and social factors that come to bear on the assignment of a diagnosis of mental illness, that I would have been forever skeptical of a neat biochemical marker.

A chemical modification of DMPEA that has been explored in this question of pink spots, mental pathology, and diagnostic markers, is the corresponding acetamide. One of the metabolites of DMPEA was found to be the N-acetyl deriva-tive, N-acetyl-3,4- dimethoxyphenethylamine. It was found to be demethylated in man, and to have pharmacological activity in animals. Maybe this was the active compound that could be involved in the schizophrenic process. But human trials with it, as with the principal metabolite 3,4-dimethoxyphenylacetic acid, showed nothing at all in man.

Another chemical modification is the beta-hydroxy analogue of DMPEA. It has been explored separately, and is the subject of its own recipe, in its own rights. See DME.

Pink was not the only colorful spot associated with schizophrenia. Somewhere at about this same time, a research paper from Canada reported the observation of a mauve spot in the chromatographic analysis of urines of schizophrenic patients. This had nothing to do with DMPEA. I was working closely with a researcher at the psychiatric institute and we were fascinated by, again, a possible diagnostic marker. We assayed the urines of the next 10 patients being admitted as acute schizophrenics. No trace of mauve. We wrote to Canada, and verified the analytical procedure. We were told that the whatzis should have been added after, rather than before, the whosey, and that we should have heated for 30, not 10 minutes. Okay. We assayed the urines of the next 10 patients being admitted using these new directions. No trace of mauve. Another call to Canada, and we were informed that we still weren't doing it right. They were consistently batting a 100% positive correlation between mauve spots and schizophrenics, and 0% with healthy controls. In fact, they actually gave this positive test the name of a disease, Malvaria.

Then, that little burst of insight! Aha! What if, just what if, they had been seeing something given to their schizophrenics? Chlorpromazine was the popular treatment of the day. We took a whopping dose of chlorpromazine, and over the next couple of days did manage (barely) to collect our urine samples. Both of us were positive Malvarians! And three days later, we were again negative. We were most likely seeing a metabolite of chlorpromazine. One last call to Canada with the ultimate question--had you given any medication to your schizophrenics before your urine analysis? Of course (came the answer)--it would not be ethical to leave them untreated. Another color down the drain, and still no objective measure for mental illness.

By the way, I cannot say I like the chlorpromazine trip. There is no real communication either with others or with yourself, with that stuff. You are a zombie, but if you are both schizophrenic and a zombie, you cannot possibly be troublesome for anybody in the emergency room.


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