<i>N</i>,<i>N′</i>-Dioxide/Gadolinium(III)-Catalyzed Asymmetric Conjugate Addition of Nitroalkanes to α,β-Unsaturated Pyrazolamides
作者:Qian Yao、Zhen Wang、Yuheng Zhang、Xiaohua Liu、Lili Lin、Xiaoming Feng
DOI:10.1021/acs.joc.5b00649
日期:2015.6.5
A highly efficient N,N′-dioxide/Gd(III) complex has been developed for the enantioselective conjugate addition of nitroalkanes to α,β-unsaturated pyrazolamides. Under mild reaction conditions, a series of γ-nitropyrazolamides were obtained in good to excellent yields (up to 99%) with excellent enantioselectivities (up to 99% ee). What’s more, the optically active products could be easily transformed
已开发出一种高效的N,N'-二氧化物/ Gd(III)络合物,用于将硝基烷烃对映选择性共轭加成到α,β-不饱和吡唑酰胺上。在温和的反应条件下,获得了一系列γ-硝基吡唑酰胺,收率好至极好(高达99%),对映选择性极好(ee高达99%)。而且,旋光产物可以很容易地转化为γ-硝基酯,这是制备帕罗西汀,普瑞巴林和博氯芬的关键中间体。