Enantio- and Diastereoselective Nitro-Mannich Reactions with in situ Generated N-Boc-imines Catalyzed by a Bifunctional Thiourea-Guanidine Catalyst
作者:Cheng Peng、Bo Han、Wei Huang、Li Guo、Rong Hu
DOI:10.1055/s-0031-1289885
日期:2011.12
asymmetric nitro-Mannich reactions of nitroalkanes and in situ generated N-Boc-imines were achieved with a new type of thiourea-guanidine bifunctional organocatalyst. The novel transformations exhibited good diastereoselectivities, and the adducts bearing adjacent chiral centers were generally obtained in moderate to high enantioselectivities (up to 94% ee). This reaction provides a concise and alternative
新型的硫脲-胍双功能有机催化剂实现了硝基烷与原位生成的N -Boc-亚胺的不对称硝基-曼尼希反应。新的转化表现出良好的非对映选择性,带有相邻手性中心的加合物通常以中等至高对映选择性(最高94%ee)获得。该反应提供了简洁易用的途径,将容易获得且稳定的N-氨基甲酸酯酰胺砜转化为旋光的1,2-二氨基化合物。 有机催化-硝基曼尼希反应-硫脲-胍催化剂-原位生成的亚胺