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。