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mptp2.txt
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1995-11-30
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>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.
=============================================================================
Newsgroups: alt.drugs
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."