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Preparation of 1,4-di-substituted piperazine

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专利汇可以提供Preparation of 1,4-di-substituted piperazine专利检索,专利查询,专利分析的服务。并且PURPOSE: To prepare the title compound by reacting 1-(2-phenyl-2-alkoxyethyl)- piperazine, etc. with cyclopropiophenone in the presence of an alkali metal sulfite, a hydrogen halide, and an alkali metal carbonate.
CONSTITUTION: The compound II is prepared by reacting a compound I (R is H or alkyl) with cyclopropiophenone in the presence of an alkali metal sulfite, a hydrogen halide, and an alkali metal carbonate, pref. in water or in an organic solvent (e.g. alcohol, ether, aromatic hydrocarbon, etc.) at a temperature between room temperature and the boiling point of the reaction mixture, for several to 24 hr.
EFFECT: The objective compound can be obtained in high purity and yield, with a simple and economical process.
USE: An antitussive (the compound II wherein R is ethyl, is known as "Eprazinone"), etc.
COPYRIGHT: (C)1980,JPO&Japio,下面是Preparation of 1,4-di-substituted piperazine专利的具体信息内容。

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