Regioselective two step synthesis of 3-substituted 2-aminoimidazo[1,2-a]pyrimidines
作者:Santiago Carballares、Marta M. Cifuentes、Gregory A. Stephenson
DOI:10.1016/j.tetlet.2006.11.181
日期:2007.3
the regioselective synthesis of 3-substituted-2-aminoimidazo[1,2-a]pyrimidines is described. The key step is a Dimroth rearrangement of a mixture of 2 and 3-substituted aminoimidazo[1,2-a]pyrimidines that yields quantitatively one regioisomer. Reaction screening for the rearrangement step is reported. A multicomponent isocyanide based reaction is chosen as the preferred way for the synthesis of the precursors
描述了两步程序,用于区域选择性合成3-取代的2-氨基咪唑并[1,2- a ]嘧啶。关键步骤是2和3个取代的氨基咪唑并[1,2- a ]嘧啶混合物的Dimroth重排,可定量地产生一种区域异构体。报告了用于重排步骤的反应筛选。选择基于多组分异氰化物的反应作为合成前体的优选方式。已通过X射线测定某些代表性化合物来完成区域化学的阐明。