Dehydration of substituted 2-(2-oxopyrrolidin-1-yl)acetamides with phosphoryl chloride provides a convenient method of synthesis of 2-chloro-6,7-dihydro-5H-pyrrolo[1,2-a]imidazoles. The latter can be readily converted to various derivatives via introduction and modification of a substituent in the 3-position. The chlorine atom in the 2-position can be removed by hydrogenation over Raney nickel.
取代的2-(2-氧
吡咯烷-1-基)乙酰胺与
磷酰
氯的脱
水提供了合成2-
氯-6,7-二氢-5 H-
吡咯并[1,2- a ]
咪唑的简便方法。通过在3-位上引入和修饰取代基,后者可以容易地转化成各种衍
生物。2位的
氯原子可通过阮内
镍氢化而除去。