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- In article <1992Dec23.073154.15839@u.washington.edu> lamont@hyperreal.com (Lamont Granquist) writes:
- >MPTP is produced by a synthetic error in making MPPP, which is an opiate
- >whose chemical formula I don't seem to have on hand. From what I read on
-
- As well as I remember, from having looked into this a few years ago,
- MPPP is the propanoate ester of 4-phenyl,4-hydroxy,N-methylpiperidine.
-
-
- Me Me
- | |
- N this can lose N
- / \ propanoic acid / \
- CH2 CH2 to give CH2 CH2
- | | | |
- CH2 CH2 CH2 CH
- \ / \ //
- C C
- / \ O |
- Ph OC3H5 Ph
-
- MPPP MPTP
-
- MPTP is oxidized _in vivo_ to MPP+, the toxic species. I think
- deprenyl showed some indication in preventing the oxidation.
- I don't think MPTP has any opiate activity itself, and I believe it
- was produced simply by accident. The reaction MPPP -> MPTP goes
- rapidly as temperature is increased.
-
- A technical note: I say MPPP loses propanoic acid rather than
- water because I don't think the free hydroxy compound is ever
- isolated in the synthesis. And, of course, it is made via
- everyone's favorite organic name reaction, the Grignard.
- --
- David J. Heisterberg (djh@osc.edu) Hoeren Sie gut zu,
- The Ohio Supercomputer Center und wiederholen Sie!
- Columbus, Ohio -- ALM German
-
- =============================================================================
-
- Newsgroups: alt.drugs
- From: pbray@envy.reed.edu (Public account)
- Date: Sun, 11 Apr 1993 01:52:02 GMT
- Message-ID: <1993Apr11.015202.3963@reed.edu>
-
- Okay I made a mistake after all. I went and checked the source (Grilly,
- Drugs and Human Behaviour) and the story was about MPTP. Here is the
- exerpt pertaining to this:
-
- "Recently the danger of this was well illustrated by the discovery that
- the sloppy laboratory practices of a man attempting to synthesize analogs
- of the narcotic meperidine for street sale in nothern California resulted
- in the chemical l-methyl-4-phenyl-1,2,5,6-tetrahydropyridine (MPTP)
- (Lewin, 1984). The substance has been found to metabolize in the brain
- into a compound that kills midbrain dopaminergic cells whose axons project
- to neurons in the basal ganglia. This produces clinical symptoms
- essentially identical to those of parkinson's disease. The phenomenon was
- first described in 1979 in the case of a 23-year-old graduate student who
- had developed parkinsonian-like condition after using a meperidine-like
- drug that he synthesized in his own laboratory. ... Unfortunatly, the
- student was not the only one who used the adulterated substance, and
- several dozen young users of this synthetic heroin [sic] have now
- succumbed to a similar fate- a lifetime (which could be quite short) of
- tremors, partial or complete paralysis, and abnormal posture."
-