Enantioselective construction of bicyclo[3.1.0]hexane derivatives through asymmetric deprotonation of meso-cyclic ketones
作者:Hitoshi Abe、Takenori Tsujino、Kenta Araki、Yasuo Takeuchi、Takashi Harayama
DOI:10.1016/s0957-4166(02)00405-6
日期:2002.8
An efficient asymmetric synthesis of bicyclo[3.1.0]hexane derivatives was achieved. The three-step conversion of 6-hydroxytricyclo[3.2.1.02,7]octan-3-one 2, (derived from 3-oxatricyclo[3.3.1.02,4]nonan-7-one 1 through an asymmetric deprotonation reaction) led to 6 in optically active form. Alternatively, the asymmetric deprotonation reaction of meso-cyclic ketones 9a and 9b with several chiral lithium
实现了双环[3.1.0]己烷衍生物的有效不对称合成。3-羟基三环[3.2.1.0 2,7 ]辛烷-3-酮2的三步转化(通过不对称去质子化反应衍生自3-氧三环[3.3.1.0 2,4 ]壬南-7-酮1)导致6以光学活性形式存在。可替代地,所述不对称的去质子化反应内消旋-环状酮类图9a和9b中与几个手性氨基化锂的碱进行了检查,得到甲硅烷基烯醇醚12和三氟甲磺酸酯21与高对映选择性。Triflate 21的绝对配置通过研究21和6之间的化学关系确定。