Process for the preparation of diacylated 4-imidazolin-2-ones

摘要

A process for the preparation of a diacylated 4-imidazolin-2-one of the formula <IMAGE> (I) wherein R1 and R2 independently represent hydrogen, optionally substituted alkyl, cycloalkyl, aryl and alkoxy, which comprises contacting a compound of the formula of II <IMAGE> (II) wherein R1 and R2 of the previously assigned significance with a source of chlorine at a temperature from 20 DEG to 150 DEG C. in the presence of a radical forming agent or under ultra-violet light and thereafter dehydrohalogenating or dehalogenating the resultant chlorinated product the diacylated 4-imidazolin-2-ones prepared by the process are useful for photochemical cycloadditions and as intermediates for the preparation of compounds in the biotin series.