Lewis Base Activation of Lewis Acids: Catalytic Enantioselective Glycolate Aldol Reactions
作者:Scott E. Denmark、Won-jin Chung
DOI:10.1002/anie.200705499
日期:2008.2.22
Lewis Base Activation of Lewis Acids: Catalytic, Enantioselective Addition of Glycolate-Derived Silyl Ketene Acetals to Aldehydes
作者:Scott E. Denmark、Won-jin Chung
DOI:10.1021/jo8006539
日期:2008.6.1
A catalytic system involving silicon tetrachloride and a chiral, Lewis basic bisphosphoramide catalyst is effective for the addition of glycolate-derived silyl ketene acetals to aldehydes. It was found that the sense of diastereoselectivity could be modulated by changing the size of the substituents on the silyl ketene acetals. In general, the trimethylsilyl ketene acetals derived from methyl glycolates