First example of an organocatalytic asymmetric Mannich reaction between aldimines of glycinates and sulphonyl imines
作者:Lei Wu、Guangxun Li、Migu He、Yingwei Wang、Gang Zhao、Zhuo Tang
DOI:10.1139/cjc-2016-0089
日期:2016.9
enantioselective Mannich-type reaction between glycinate Schiff base and imines has been one of the most efficient routes for accessing α,β-diamino acids. However, the glycinate Schiff bases used in the references were almost ketimines. Only several examples of aldimines were used in the presence of metal catalyst. We developed the first example of an asymmetric direct Mannich reaction using aldimines of glycinates
甘氨酸席夫碱和亚胺之间的催化对映选择性曼尼希型反应是获取 α,β-二氨基酸的最有效途径之一。然而,参考文献中使用的甘氨酸席夫碱几乎是酮亚胺。在金属催化剂的存在下仅使用了几个醛亚胺的例子。我们开发了第一个使用甘氨酸醛亚胺代替甘氨酸酮亚胺进行不对称直接曼尼希反应的例子。该反应由手性胍很好地催化,具有高产率(高达 92%)和中等立体选择性(高达 65%)。