Asymmetric <i>Syn</i>-Selective Henry Reaction Catalyzed by the Sulfonyldiamine−CuCl−Pyridine System
作者:Takayoshi Arai、Ryuta Takashita、Yoko Endo、Masahiko Watanabe、Akira Yanagisawa
DOI:10.1021/jo800412x
日期:2008.7.1
catalytic asymmetric Henry reaction has been developed with use of a sulfonyldiamine−CuCl complex as a catalyst. A series of new binaphthyl-containing sulfonyldiamine ligands (2a−h) were readily synthesized in two steps starting from commercially available chiral 1,2-diamines. The (R,R)-diamine-(R)-binaphthyl ligand (2d)−CuCl complex smoothly catalyzed the enantioselective Henry reaction with the assistance
通过使用磺酰基二胺-CuCl络合物作为催化剂,已经开发出催化不对称亨利反应。从可商购的手性1,2-二胺开始,分两步轻松合成了一系列新的含联萘基的磺酰基二胺配体(2a - h)。(R,R)-二胺-(R)-联萘配体(2d)-CuCl配合物在吡啶的协助下平稳催化对映选择性亨利反应,得到相应的对映体,其对映体过量很高(最高达93%)。此外,2D -CuCl吡啶系统促进了非对映选择性Henry反应顺-选择性的方法以高达99%的收率得到加合物,且顺/反选择性为92:8 。顺式加合物的对映体过量为84%ee。