[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF N-SUBSTITUTED HETERO CYCLIC DERIVATIVES<br/>[FR] PROCEDE AMELIORE DE PREPARATION DE DERIVES HETEROCYCLIQUES N-SUBSTITUES
申请人:MATRIX LAB LTD
公开号:WO2005122699A2
公开(公告)日:2005-12-29
The present invention relates to a process for preparation of N-substituted 1-[(biphenyl-4 yl)methyl-2-n-butyl-4-spirocylopentane-2-imidazolin-5-one by suspending 4'-(Bromomethyl) [ 1,1'-biphenyl] derivative in aqueous solution of an in-organic base and adding the solution of 2-butyl-1, 3-diazaspiro [4,4] nonan-4-one in water-miscible organic solvent at temperature of 20°C to 55°C. Maintaining the reaction mixture at 25°C to about reflux temperature of the solvent followed by removing the solvent under reduced pressure, dissolving the residue in wafer-immiscible organic solvent, distilling under reduced pressure aid crystallizing the residue from acetonitrile.