作者:Jean Michalland、Samir Z. Zard
DOI:10.1021/acs.orglett.1c03022
日期:2021.10.15
A modular, stereoselective route to trisubstituted (Z)-alkenyl (MIDA)boronates is described, consisting of the radical addition–fragmentation of dithiocarbonates to 2-(MIDA)boronyl-3-(2′-fluoro-pyridyl-6′-oxy)-alkenes. The bulky (MIDA)boronate ensures a highly stereoselective fragmentation that is enhanced by the poor stabilization of the radical adjacent to the tetravalent boron atom. The vinyl boronate
描述了一种生成三取代 ( Z )-烯基 (MIDA) 硼酸酯的模块化立体选择性路线,包括二硫代碳酸酯的自由基加成 - 断裂成 2-(MIDA)boronyl-3-(2'-fluoro-pyridyl-6'-oxy) )-烯烃。庞大的 (MIDA) 硼酸盐确保高度立体选择性碎裂,其通过与四价硼原子相邻的自由基的稳定性差而增强。乙烯基硼酸酯前体是由炔丙醇通过铜催化的氟吡啶氧基衍生物的区域选择性原硼化反应制备的,氟吡啶作为内部导向基团。