Quinine-Promoted, Enantioselective Boron-Tethered Diels–Alder Reaction by Anomeric Control of Transition-State Conformation
作者:Katie Scholl、John Dillashaw、Evan Timpy、Yu-hong Lam、Lindsey DeRatt、Tyler R. Benton、Jacqueline P. Powell、K. N. Houk、Jeremy B. Morgan
DOI:10.1021/acs.joc.8b00938
日期:2018.5.18
Diels–Alder reactions of tethered vinyl–metal species offer the opportunity to fashion highly functionalized diol intermediates for synthesis. We have developed the first enantioselective boron-tethered Diels–Alder reaction using quinine as a chiral promoter. Quinine recovery, enantioselectivity enhancement, and manipulation of the cyclohexene core are also investigated. DFT modeling calculations confirm
拴系的乙烯基金属物种的Diels-Alder反应为有机合成高度官能化的二醇中间体提供了机会。我们已经开发了第一个使用奎宁作为手性启动子的对映选择性硼系Diels-Alder反应。还研究了奎宁的回收,对映体选择性的增强以及对环己烯核的操作。DFT建模计算证实了奎宁作为双齿配体提高反应速率的作用。提出环加成的对映选择性源于以硼为中心的异头作用。