Organocatalytic cycloaddition of carbonyl sulfide with propargylic alcohols to 1,3-oxathiolan-2-ones
作者:Hui Zhou、Rui Zhang、Hui Zhang、Sen Mu、Xiao-Bing Lu
DOI:10.1039/c9cy00062c
日期:——
adducts of a Lewis base (LB) were synthesized and first used to catalyze the cycloaddition of COS with propargylic alcohols under mild reaction conditions, selectively providing the functionalized 1,3-oxathiolane-2-ones with complete (Z) configuration selectivity. Among them, COS adducts of highly polarized olefins proved to be highly efficient organocatalysts for this transformation, with excellent yields
合成了路易斯碱(LB)的一系列羰基硫(COS)加合物,并首先用于在温和的反应条件下催化COS与炔丙醇的环加成反应,选择性地提供官能化的1,3-氧杂硫杂环戊烷-2-酮(Z)构型选择性。其中,高极化烯烃的COS加合物被证明是该转化的高效有机催化剂,具有优异的收率和广泛的官能团相容性。通过同位素标记和化学计量实验进行的机理研究无可辩驳地表明,催化反应是通过LB-COS加合物介导的亲核加成机理。通过结合气体捕获(活化)和催化剂的功能,该策略为经济高效的COS还原工艺提供了方向。