Guanidine Organocatalyst for the Asymmetric Mannich-Type Reaction between α-Isothiocyanato Imide and Sulfonyl Imines
作者:Xiaohong Chen、Shunxi Dong、Zhen Qiao、Yin Zhu、Mingsheng Xie、Lili Lin、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/chem.201002571
日期:2011.2.25
A highly efficient bisguanidine organocatalyst has been developed for the asymmetric Mannich‐type reaction of α‐isothiocyanato imide with N‐Ts‐protected imines (Ts=tosyl, see scheme). A series of aromatic, α,β‐unsaturated, heteroaromatic, and aliphatic imines can be converted into the desired α,β‐diamino acid derivatives in good to excellent yields with high diastereoselectivities (up to >95:5 d.r
已开发出一种高效的双胍有机催化剂,用于α-异硫氰酸根酰亚胺与N -Ts-保护的亚胺的不对称曼尼希型反应(Ts =甲苯磺酰基,参见方案)。一系列芳族,α,β-不饱和,杂芳族和脂肪族亚胺可以高产率,高非对映选择性(高达> 95:5 dr)和出色的对映选择性(理想的产率)转化为所需的α,β-二氨基酸衍生物。在温和条件下可达> 99%ee)。还提出了反应的可能过渡态。