Methyl iodide → 4-Benzyl-1-methylpiperazin-2-one

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Reaction Steps

Sodium hydride (50% in oil, 10.4 g., 0.22 mole) is added to a stirred solution of 4-(phenylmethyl)piperazinone (Example 45, 38.0 g., 0.20 mole) in THF (2.0 l.). After 1 hour methyl iodide (80.0 g., 0.75 mole) is added and the reaction solution is refluxed for 2.5 hours. The THF is removed under reduced pressure and the residual oil is partitioned between chloroform and water. Evaporation of the chloroform gives an oil which is chromatographed on silica gel to give the title compound, which is converted to the p-ISA salt, m.p. 138°-140°.

Provenance & Evidence