Catalytic Asymmetric [4 + 1] Annulation of Sulfur Ylides with Copper–Allenylidene Intermediates
作者:Qiang Wang、Tian-Ren Li、Liang-Qiu Lu、Miao-Miao Li、Kai Zhang、Wen-Jing Xiao
DOI:10.1021/jacs.6b04414
日期:2016.7.13
1] cycloaddition of propargylic carbamates and sulfur ylides was successfully developed. This strategy led to a series of chiral indolines with synthetically flexible alkyne groups in good yields and with high enantio- and diastereoselectivities (up to 99% yield, 98% ee, and >95:5 dr). A possible mechanism and stereoinduction mode with copper-allenylidenes were proposed as the possible dipolar intermediate
成功开发了第一个铜催化的炔丙基氨基甲酸酯和硫叶立德的不对称脱羧 [4 + 1] 环加成反应。这种策略导致了一系列具有合成柔性炔基的手性二氢吲哚,产率高,对映选择性和非对映选择性高(产率高达 99%,ee 高达 98%,dr>95:5)。提出了可能的偶极中间体铜-亚丙叉基的可能机制和立体感应模式。