Chiral Guanidinium Salt Catalyzed Enantioselective Phospha-Mannich Reactions
作者:Xiao Fu、Wei-Tian Loh、Yan Zhang、Tao Chen、Ting Ma、Hongjun Liu、Jianmin Wang、Choon-Hong Tan
DOI:10.1002/anie.200903971
日期:2009.9.21
Zero, one, or two? Guanidinium catalyst 1⋅HBArF4 (ArF=3,5‐(CF3)2C6H3, Bn=benzyl, Ts=4‐toluenesulfonyl) was obtained in a single step from a commercially available diamine. By using this catalyst an asymmetric phospha‐Mannich reaction has been developed, involving secondary phosphine oxides and H‐phosphinates as the P nucleophile. A series of enantiomerically enriched α‐amino phosphine oxides (2), α‐amino