Cu(I)-Catalyzed Asymmetric α-Allenylation of Activated Ketimines with 3-Butynoates
作者:Guang-Yao Ran、Chen Chen、Xing-Xing Yang、Zhi Zhao、Wei Du、Ying-Chun Chen
DOI:10.1021/acs.orglett.0c01534
日期:2020.6.19
An asymmetric α-regioselective allenylation reaction of activated ketimines with 3-butynoates is disclosed under Cu(I) catalysis, probably via the generation of nucleophilic γ-allenylcopper species in the presence of diisopropylethylamine. A broad range of imines, derived from diverse ketones such as isatins, pyrazolediones, isoquinoline-1,3,4-triones, and even trifluoromethyl alkynyl ketones, can
在Cu(I)催化下,公开了活化的酮亚胺与3-丁酸酯的不对称α-区域选择性烯丙基化反应,可能是在二异丙基乙胺存在下通过亲核性γ-烯基铜物种的产生。可以使用广泛的亚胺,这些亚胺衍生自不同的酮,例如靛红,吡唑二酮,异喹啉-1,3,4-三酮,甚至三氟甲基炔基酮,通常可以高收率获得相应的α-烯基胺衍生物(≤ 97%)具有出色的对映选择性(≤99%ee)。