Enantioselective Phospha-Michael Reaction of Diphenyl Phosphonate with Nitroolefins Utilizing Conformationally Flexible Guanidinium/Bisthiourea Organocatalyst: Assembly-State Tunability in Asymmetric Organocatalysis
作者:Yoshihiro Sohtome、Natsuko Horitsugi、Rika Takagi、Kazuo Nagasawa
DOI:10.1002/adsc.201100219
日期:2011.10
phospha-Michael reaction of diphenyl phosphonate to nitroolefins was achieved by utilizing a 1,3-diamine-tethered guanidinium/bisthiourea organocatalyst. The procedure is applicable to nitroolefins having various aromatic and aliphatic substituents, and enables an efficient access to phospha-Michael products with 90–98% ee. Monomeric or oligomeric active species of the catalyst can be utilized, depending
二苯基膦酸酯与硝基烯烃的催化对映选择性膦-迈克尔反应是通过利用1,3-二胺连接的胍/双硫脲有机催化剂实现的。该程序适用于具有各种芳香族和脂肪族取代基的硝基烯烃,并能有效获得ee为90-98%的磷-迈克尔产品。取决于水的存在或不存在,可以使用催化剂的单体或低聚活性物质。