申请人:Bayer Aktiengesellschaft
公开号:US04238618A1
公开(公告)日:1980-12-09
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.
一种制备化合物的方法,该化合物为公式##STR1##中的二酰化4-咪唑啉-2-酮,其中R.sup.1和R.sup.2独立地代表氢、可选择地取代的烷基、环烷基、芳基和烷氧基,该方法包括将公式II的化合物##STR2##(其中R.sup.1和R.sup.2具有先前指定的含义)与氯源在20°C至150°C的温度下接触,在自由基形成剂或紫外光的存在下脱氢卤化或脱卤化所得的氯化产物,通过该方法制备的二酰化4-咪唑啉-2-酮可用于光化学环加成反应,并作为生物素系列化合物制备的中间体。