作者:Luca Bernardi、Jesús López-Cantarero、Barbara Niess、Karl Anker Jørgensen
DOI:10.1021/ja0707097
日期:2007.5.1
systems and substituents in high yields and enantioselectivities. The potential of this new organocatalytic 1,6-addition for β-ketoesters is demonstrated by a two-step synthesis of the bicyclo[3.2.1]octan-8-one structure, a bicyclic bridged skeleton occurring in a variety of natural compounds. Benzophenone imines also undergo the organocatalytic asymmetric 1,6-addition to the activated dienes in high yi
首次使用金鸡纳生物碱在相转移条件下将 β-酮酯和二苯甲酮亚胺有机催化对映选择性 1,6-加成到缺电子的 δ-未取代二烯。β-酮酯的反应范围概述了与具有酮、酯和砜的不同 δ-未取代二烯作为吸电子取代基的反应,以良好的产率和对映选择性在 90-99 范围内得到相应的光学活性产物% ee。1,6-加成还以高产率和对映选择性与许多具有不同环大小、环系统和取代基的环状β-酮酯一起进行。通过双环[3.2.1]octan-8-one结构的两步合成证明了这种新的有机催化1,6-加成对β-酮酯的潜力,存在于多种天然化合物中的双环桥接骨架。二苯甲酮亚胺也经历了有机催化不对称 1,6-加成到活性二烯的高活性...