Stereoselective Synthesis of Trisubstituted Alkenes through Sequential Iron-Catalyzed Reductive<i>anti</i>-Carbozincation of Terminal Alkynes and Base-Metal-Catalyzed Negishi Cross-Coupling
作者:Chi Wai Cheung、Xile Hu
DOI:10.1002/chem.201504049
日期:2015.12.7
stereoselective synthesis of trisubstituted alkenes is challenging. Here, we show that an iron‐catalyzed anti‐selective carbozincation of terminal alkynes can be combined with a base‐metal‐catalyzed cross‐coupling to prepare trisubstituted alkenes in a one‐pot reaction and with high regio‐ and stereocontrol. Cu‐, Ni‐, and Co‐based catalytic systems are developed for the coupling of sp‐, sp2‐, and sp3‐hybridized
三取代烯烃的立体选择性合成具有挑战性。在这里,我们表明,末端炔烃的铁催化抗选择性碳氧化可与贱金属催化的交叉偶联结合在一起,以一锅法反应和高度的区域和立体控制制备三取代的烯烃。开发了基于Cu,Ni和Co的催化系统,分别用于耦合sp,sp 2和sp 3杂交的碳亲电体。该方法涵盖了较大的底物范围,因为各种炔基,芳基,烯基,酰基和烷基卤化物是合适的偶联伴侣。与传统的炔烃碳金属化反应相比,当前方法避免了预制的有机金属试剂,并且具有独特的立体选择性。