In the presence of the readily available quinine-derived catalyst 4d, highly diastereo- and enantioselective Mannich reactions of tosyl-protected imines and α-isothiocyanato imides proceeded to afford the protected α,β-diamino acids, useful building blocks for natural products and biologically active compounds, in good to excellent yields.
                                    在容易获得的
奎宁衍生的催化剂4d的存在下,
甲苯磺酰基保护的
亚胺和α-异
硫氰酸根
酰亚胺的高度非对映和对映选择性曼尼希反应可提供受保护的α,β-二
氨基酸,
天然产物和
生物学上有用的结构单元活性化合物,收率好至极好。