Synthesis of α,β-Unsaturated α′-Haloketones through the Chemoselective Addition of Halomethyllithiums to Weinreb Amides
作者:Vittorio Pace、Laura Castoldi、Wolfgang Holzer
DOI:10.1021/jo401236t
日期:2013.8.2
A straightforward synthesis of variously functionalized α,β-unsaturated α′-haloketones has been achieved through the chemoselective addition of halomethyllithium carbenoids to Weinreb amides at −78 °C. A comparative study employing the corresponding esters under the same reaction conditions pointed out that the instability of the tetrahedral intermediate formed from the latter is responsible for the
通过在-78°C下将卤代甲基锂类胡萝卜素化学选择性加成到Weinreb酰胺中,已经实现了各种功能化的α,β-不饱和α'-卤代酮的直接合成。在相同的反应条件下使用相应的酯进行的比较研究指出,由后者形成的四面体中间体的不稳定性是观察到的甲醇形成的原因,而不是所需的卤代酮。