Enantioselective activation of ethers by chiral organoaluminum reagents: Application to asymmetric Claisen rearrangement
作者:Keiji Maruoka、Hiroshi Banno、Hisashi Yamamoto
DOI:10.1016/s0957-4166(00)86119-4
日期:1991.1
asymmetric Claisen rearrangement of allyl vinyl ethers has been effected with a chiral organoaluminum reagent, (R)-1 or (S)-1 as an example of the enantioselective activation of ether substrates. This method provides a facile asymmetric synthesis of various acylsilanes and acylgermanes with high optical purity. Among various trialkylsilyl substituents of chiral organoaluminum reagent 1, use of the more
烯丙基乙烯基醚的不对称克莱森重排已通过手性有机铝试剂(R)-1或(S)-1进行,作为醚底物的对映选择性活化的一个实例。该方法提供了具有高光学纯度的各种酰基硅烷和酰基锗烷的容易的不对称合成。在手性有机铝试剂1的各种三烷基甲硅烷基取代基中,使用更大体积的叔丁基二苯基甲硅烷基具有最高的对映选择性。对烯丙基乙烯基醚底物的两种可能的椅子状过渡态结构的构象分析表明,手性有机铝试剂1 可以仅通过醚的α-亚甲基的取向差异来区分这两个构象。