Simple One-pot Conversion of Aldehydes and Ketones to Enals
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