Momiyama Norie, Yamamoto Hisashi
Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, USA.
J Am Chem Soc. 2005 Feb 2;127(4):1080-1. doi: 10.1021/ja0444637.
Two types of chiral Brønsted acid catalysts have been shown to catalyze regio- and enantioselective nitroso aldol synthesis between nitrosobenzene and achiral enamine. The combination of Brønsted acidity and amine moiety of enamine realizes complete regioselectivity with high enantioselectivity. After a survey of Brønsted acid catalysts, 1-naphthyl glycolic acid is found to be optimal in the O-nitroso aldol pathway, while 1-naphthyl TADDOL is the best catalyst for the N-nitroso aldol pathway. This is based on our finding on the control of regioselectivity by changing the amine moiety of enamine and the choice of Brønsted acidity.
两种手性布朗斯特酸催化剂已被证明可催化亚硝基苯与非手性烯胺之间的区域和对映选择性亚硝基羟醛缩合反应。布朗斯特酸度与烯胺的胺部分相结合,实现了完全的区域选择性和高对映选择性。在对布朗斯特酸催化剂进行考察后,发现1-萘基乙醇酸在O-亚硝基羟醛缩合途径中是最优的,而1-萘基TADDOL是N-亚硝基羟醛缩合途径的最佳催化剂。这是基于我们通过改变烯胺的胺部分来控制区域选择性以及对布朗斯特酸度的选择所得到的发现。