Catalytic asymmetric cyclopropanation using copper complex of optically active bipyridine as a catalyst
作者:Katsuji Ito、Tsutomu Katsuki
DOI:10.1016/s0040-4039(00)77650-7
日期:1993.4
Optically active 8,8′-di(trimethylsilyl)-5,5′,6,6′,7,7′,8,8′-octahydro-2,2′-biquinoline (7) was found to be an effective catalyst for enantioselective cyclopropanation of olefins. For example, the reaction of styrene and t-butyl diazoacetate in the presence of 7 proceeded with high enantioselectivity of 92% ee, to give t-butyl trans-2-phenylcyclopropanecarboxylate. On the other hand, the reaction of
发现旋光的8,8'-二(三甲基甲硅烷基)-5,5',6,6',7,7',8,8'-八氢-2,2'-联喹啉(7)是有效的催化剂用于烯烃的对映选择性环丙烷化。例如,苯乙烯和的反应吨丁基重氮基在存在7用92%ee的的高对映选择性进行,以得到吨丁基反式-2- phenylcyclopropanecarboxylate。另一方面,反式-β-甲基苯乙烯的反应得到了主要产物> 99%ee的顺式异构体。