作者:Qi-Xiang Guo、Hua Liu、Chang Guo、Shi-Wei Luo、Yi Gu、Liu-Zhu Gong
DOI:10.1021/ja068236b
日期:2007.4.1
A chiral Bronsted acid-catalyzed direct asymmetric Mannich reaction has been described. Various phosphoric acids, prepared from BINOL and H-8-BINOL derivatives, have been evaluated for catalyzing the direct Mannich reaction. In the presence of a truly catalytic amount of the phosphoric acid, anti-selective Mannich reactions of cyclic ketones with a wide scope of aldimines were obtained in high yields with excellent enantioselectivities (up to 98% ee) and high diastereomeric ratios (up to 98/2 dr). A one-pot Mannich reaction using aromatic ketones as donors proceeded smoothly to give beta-amino carbonyls with fairly good enantioselectivities.