New approach to the preparation of bicyclo octane derivatives via the enantioselective cascade reaction catalyzed by chiral diamine-Ni(OAc)2 complex
作者:Wenyi Li、Xiaodong Liu、Zhifeng Mao、Qiao Chen、Rui Wang
DOI:10.1039/c2ob25135c
日期:——
efficient catalyst system assembled from enantiomerically pure diaminocyclohexane and Ni(OAc)2 is, for the first time, used to catalyze the cascade Michael–Henry reaction of various diones and substituted nitroalkenes. A series of polyfunctionalized bicyclo[3.2.1]octane derivatives containing four stereogenic centers are prepared with excellent enantioselectivities (up to >99% ee) and diastereoselectivities
由对映体纯组装而成的高效催化剂体系 二氨基环己烷Ni(OAc)2首次用于催化各种二酮和取代的硝基烯烃的级联Michael-Henry反应。制备了具有四个立体生成中心的一系列多官能化双环[3.2.1]辛烷衍生物,它们具有极高的对映选择性(高达> 99%ee)和非对映选择性(高达50:1 dr),并具有高收率。另外,通过该手性二胺-Ni(OAc)2催化剂体系,可以防止导致立体选择性降低的碱诱导的差向异构化。