Enantioselective Organocatalysis of Strecker and Mannich Reactions Based on Carbohydrates
作者:Christian Becker、Christine Hoben、Horst Kunz
DOI:10.1002/adsc.200600370
日期:2007.2.5
Efficient organocatalysts for enantioselective Strecker and Mannich reactions were constructed from glucosamine as a readily accessible chiral scaffold. A variety of aromatic aldimines were subjected to hydrocyanation with good to excellent yield (72–98 %) and, in part, high enantioselectivity (69–95 % ee). Influence of the catalyst architecture on the enantioselectivity obviously arises from restrictions
对映选择性Strecker和Mannich反应的有效有机催化剂是由氨基葡萄糖构建的,它是一种易于获得的手性支架。各种芳香醛亚胺都进行了氢氰化,收率良好至优异(72%至98%),部分对映选择性高(ee值为69%至95%)。催化剂结构对对映选择性的影响显然是由于对单糖主链的构象柔韧性施加了限制。在不对称曼尼希反应中,使用所述催化剂已经获得了中等产率(高达76%)和对映选择性(高达58%ee)。