Metopimazine

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Metopimazine
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E number{{#property:P628}}
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Chemical and physical data
FormulaC22H27N3O3S2
Molar mass445.6 g/mol
3D model (JSmol)
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Metopimazine (INN) is a phenothiazine antiemetic.

Synthesis

Metopimazine synthesis:Jacob, R. M.; Robert, J. G.; Template:Patent (1959).

The reduced basicity of phenothiazine nitrogen requires that even acylation proceed via the anion. The amide (2) from the methyl thioether (2) can be prepared, for example, by sequential reaction with sodium amide and acetic anhydride. Oxidation of that intermediate with peracid proceeds preferentially on the more electron-rich alkyl thioether to give the sulfone; this affords the phenothiazine (3) on hydrolysis of the amide. Complex side chains are most conveniently incorporated in a stepwise fashion. The first step in the present sequence involves reaction of (3) as its anion with 1-bromo-3-chloropropane to give (4). The use of that halide with alkylate piperidine-4-carboxamide (5) affords the antipsychotic agent metopimazine (6).


References

Template:Antiemetics and antinauseants