Silylformylation – Fluoride-Assisted Aryl Migration of Acetylenic Derivatives in a Versatile Approach to the Synthesis of Polyfunctionalised Compounds
作者:Laura Antonella Aronica、Patrizio Raffa、Giulia Valentini、Anna Maria Caporusso、Piero Salvadori
DOI:10.1002/ejoc.200500883
日期:2006.4
Polyfunctionalised aldehydes and dihydropyrans are prepared from easily available functionalised 1-alkynes through a two-step silylformylation/aryl migration sequence. The silylformylation process is performed under mild experimental conditions and affords the corresponding beta-silylalkenals in high yields. The fluoride-promoted migration step occurs instantaneously with quantitative conversion. The
多官能化醛和二氢吡喃是从容易获得的官能化 1-炔烃通过两步甲硅烷基甲酰化/芳基迁移序列制备的。甲硅烷基化过程在温和的实验条件下进行,并以高产率提供相应的 β-甲硅烷基链烯醛。氟化物促进的迁移步骤与定量转化同时发生。化学选择性、区域选择性和立体选择性可以根据乙炔前体上官能团的性质和位置进行调节。当炔烃的脂肪链的ω位置存在良好的离去基团时,获得环化产物,而α,p-不饱和醛则由炔丙基甲苯磺酰胺产生。((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)。