Asymmetric Mannich-type reactions with a chiral acetate: effect of Lewis acid on activation of aldimine
作者:Susumu Saito、Keiko Hatanaka、Hisashi Yamamoto
DOI:10.1016/s0040-4020(00)01042-5
日期:2001.1
addition. This scope was expanded to the asymmetric process using the chiral acetate, which has optically pure 2,6-bis(2-isopropylphenyl)-3,5-dimethylphenol as a chiral auxiliary with axial chirality. A Lewis acid additive is likely to have a complementary role in the pronounced activation of imine functionalities in the Mannich-type addition of the bulky chiral acetate.
我们在这里介绍一种策略,该策略可以将乙酸的烯醇锂有效地添加到醛亚胺中。新方法在很大程度上取决于使用邻烷氧基(或邻氟)苯胺衍生的亚胺,发现其对烯醇盐的添加有潜在影响。使用手性乙酸酯将这一范围扩展到不对称过程,该手性乙酸酯具有光学纯的2,6-双(2-异丙基苯基)-3,5-二甲基苯酚作为具有轴向手性的手性助剂。路易斯酸添加剂在庞大的手性乙酸酯的曼尼希型添加中可能在亚胺官能团的显着活化中起补充作用。