作者:Petr Valenta、Natalie A. Drucker、Jeffrey W. Bode、Patrick J. Walsh
DOI:10.1021/ol9005757
日期:2009.5.21
A simple and efficient method to convert aldehydes into α,β-unsaturated aldehydes with a two-carbon homologation is presented. Hydroboration of ethoxy acetylene with BH3·SMe2 generates tris(ethoxyvinyl) borane. Transmetalation with diethylzinc, addition to aldehydes or ketones, and acidic workup affords enals. When the addition is quenched with anilinium hydrochloride, 1,2-dithioglycol, or acetic anhydride
提出了一种通过双碳同源性将醛转化为 α,β-不饱和醛的简单有效方法。乙氧基乙炔与 BH 3 ·SMe 2 的硼氢化反应生成三(乙氧基乙烯基)硼烷。用二乙基锌进行金属转移,与醛或酮加成,以及酸性后处理得到烯醛。当加入用盐酸苯胺、1,2-二硫醇或乙酸酐淬灭时,不饱和亚胺、二硫戊环或 1,1-二乙酸盐以高产率分离。这些转化可以在一锅法中进行。