Anti-selective Mannich reactions of N-Boc and N-Cbz protected imines with unmodified aldehydes proceeded smoothly under the catalysis of a secondary amine–thiourea catalyst, which led to high yields (70%–95%) and excellent enantioselectivity (up to 96 ∶ 4 dr and >99% ee) under conventional organic synthetic operations.
在二级胺-
硫脲催化剂的作用下,N-Boc和N-Cbz保护的
亚胺与未修饰的醛进行的反选择性Mannich反应顺利进行,在常规有机合成操作条件下,产率高达70%-95%,并且具有出色的对映选择性(最高达96:4的对映体比例和>99%的ee值)。