Process for the preparation of heterocyclic alkylamide derivatives
申请人:G. D. Searle & Co.
公开号:US05731435A1
公开(公告)日:1998-03-24
The present invention relates to a novel process for the preparation of N-heterocyclealkanamide derivatives having the following formula: ##STR1## which comprises reacting 1-(2-chloroethyl)piperidine with 2-chlorobenzeneacetonitrile to give (.+-.)-.alpha.-(2-chlorophenyl)-1-piperidinebutanenitrile; alkylating the piperidenebutanenitrile to give (.+-.)-.alpha.-(2-chlorophenyl)-.alpha.-(2,2-dimethoxyethyl)piperidine-1-b utanenitrile; hydrolyzing the resulting alkylated piperidinebutanenitrile to give (.+-.)-.alpha.-(2-chlorophenyl)-.alpha.-(2-oxoethyl)piperidine-1-butanenit rile; reacting the resulting piperidinebutanenitrile with isopropylamine to form (.+-.)-.alpha.-(2-chlorophenyl)-.alpha.-\x9b2-\x9b(1-methylethyl)imino!ethyl!pip eridine-1-butanenitrile; reducing the resulting imine to form (.+-.)-.alpha.-(2-chlorophenyl)-.alpha.-\x9b2-\x9b(1-methylethyl)amino!ethyl!-pi peridine-1-butanenitrile; acetylating the resulting amine to form (.+-.)-N-\x9b3-(2-chlorophenyl)-3-cyano-5-(1-piperidinyl)pentyl!-N-(1-methyle thyl)acetamide; hydrolyzing the resulting acetylated amino substituted piperidine butanenitrile to form (.+-.)-.alpha.-\x9b2-\x9bacetyl(1-methylethyl)amino!ethyl!-.alpha.-(2-chlorophen yl)-1-piperidinebutanamide; and isolating the resulting piperidinebutanamide.