A Tandem Metal Carbene Cyclization−Cycloaddition Approach to the Pseudolaric Acids
作者:Bin Chen、Rebecca Y. Y. Ko、Mabel S. M. Yuen、Kin-Fai Cheng、Pauline Chiu
DOI:10.1021/jo026399m
日期:2003.5.1
An approach toward the synthesis of the antifungal and cytotoxic pseudolaric acids based on the tandem metal carbene cyclization-cycloaddition reaction is described. Using this strategy, the advanced intermediate 3a bearing three of the four stereocenters of the target molecules has been synthesized. The substrate-controlled diastereoselectivity of the tandem carbene cyclization-cycloaddition was preferential
描述了一种基于串联金属卡宾环化-环加成反应合成抗真菌和细胞毒性假乳酸的方法。使用这种策略,已经合成了具有目标分子的四个立体中心中的三个的高级中间体3a。卡宾环化-环加成的底物控制的非对映选择性优先于不希望的非对映异构体,但是通过使用桥本手性铑催化剂Rh(2)(S-BPTV)(4)进行试剂控制会逆转选择性,从而有利于3a。氧杂双环核的开环得到羟基环庚烯已在模型研究中得到证明。