A process for the preparation of a diacylated 4-imidazolin-2-one of the formula ##STR1## wherein R.sup.1 and R.sup.2 independently represent hydrogen, optionally substituted alkyl, cycloalkyl, aryl and alkoxy, which comprises contacting a compound of the formula of II ##STR2## wherein R.sup.1 and R.sup.2 of the previously assigned significance with a source of chlorine at a temperature from 20.degree. to 150.degree. 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.
制备4-
咪唑啉-2-酮的二酰基化的方法,该方法的
化学式如下:##STR1## 其中R1和R2分别代表氢、可选取代烷基、环烷基、芳香基和烷氧基,包括将化合物II的
化学式如下:##STR2## 其中R1和R2具有前面指定的含义,与
氯源在存在自由基形成剂或紫外线下的20℃至150℃的温度下接触,然后脱卤化或脱卤素化所得的
氯化产物。通过该方法制备的二酰基化的4-
咪唑啉-2-酮对于光
化学环加成和
生物素系列化合物的制备中间体是有用的。