Catalytic Enantioselective Amination of Enolsilanes Using <i>C</i><i><sub>2</sub></i>-Symmetric Copper(II) Complexes as Chiral Lewis Acids
作者:David A. Evans、Douglas S. Johnson
DOI:10.1021/ol990113r
日期:1999.8.1
[formula: see text] [Cu(S,S)-t-Bu-box](OTf)2 (1) catalyzes the enantioselective amination of enolsilanes with azodicarboxylate derivatives. Isomerically pure enolsilanes of aryl ketones, acylpyrroles, and thioesters added to the azo-imide in greater than 95% ee. The use of an alcohol additive was critical to achieving catalyst turnover.
[Cu:S(S,S)-t-Bu-box](OTf)2(1)催化用偶氮二羧酸酯衍生物对烯醇硅烷的对映选择性胺化。芳族酮,酰基吡咯和硫代酸酯的异构纯烯醇硅烷以大于95%ee的量添加到偶氮酰亚胺中。醇添加剂的使用对于实现催化剂周转至关重要。