A facile and regio- and stereo-selective preparation of bicyclic guanidines by iodocyclization of 3-(alk-2-enyl)-2-(substituted amino)-1-imidazolin-4-ones
作者:Masanori Watanabe、Hiroshi Okada、Takayuki Teshima、Michihiko Noguchi、Akikazu Kakehi
DOI:10.1016/0040-4020(96)00004-x
日期:1996.2
The iodocyclization of 3-(alk-2-enyl)-2-(substituted amino)-1-imidazolin-4-ones proceeded in regio- and stereo-selective manners to give bicyclic guanidines, imidazo[1,2-a]imidazole and/or imidazo[1,2-a]pyrimidine, in good yields. The regiochemistry of the cyclization depended mainly on the kind of substituents of the alkenyl moieties and was interpretable by the PM3 MO calculations of the iodonium
3-(链-2-烯基)-2-(取代的氨基)-1-咪唑啉-4-酮的碘环化以区域和立体选择性方式进行,得到双环胍,咪唑并[1,2- a ]咪唑和/或咪唑并[1,2- a ]嘧啶,收率高。环化的区域化学主要取决于烯基部分的取代基的种类,并且可以通过碘鎓离子中间体的PM3 MO计算来解释。