Enantioselective Alkynylation of Trifluoromethyl Ketones Catalyzed by Cation‐Binding Salen Nickel Complexes
作者:Dongseong Park、Carina I. Jette、Jiyun Kim、Woo‐Ok Jung、Yongmin Lee、Jongwoo Park、Seungyoon Kang、Min Su Han、Brian M. Stoltz、Sukwon Hong
DOI:10.1002/anie.201913057
日期:2020.1.7
Cation-binding salen nickel catalysts were developed for the enantioselective alkynylation of trifluoromethyl ketones in high yield (up to 99 %) and high enantioselectivity (up to 97 % ee). The reaction proceeds with substoichiometric quantities of base (10-20 mol % KOt-Bu) and open to air. In the case of trifluoromethyl vinyl ketones, excellent chemo-selectivity was observed, generating 1,2-addition
开发了阳离子结合的萨伦镍催化剂,用于高收率(高达99%)和高对映选择性(高达ee的97%)的三氟甲基酮的对映选择性炔基化反应。反应以亚化学计量的碱(10-20 mol%KOt-Bu)进行,并与空气接触。在三氟甲基乙烯基酮的情况下,观察到优异的化学选择性,仅产生1,4-加成产物,而产生1,2-加成产物。紫外可见分析表明,该催化剂的侧链低聚醚基团以1:1的化学计量比(Ka = 6.6×105 m-1)与钾阳离子(K +)牢固结合。