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 situgenerated 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