Methyl 3,3-difluoro-2-trimethylsilyloxyacrylate: preparation and Mukaiyama-type aldol condensation as a novel route to β,β-difluoro-α-keto ester derivatives
作者:Biao Jiang、Xiaobing Zhang、Guoqiang Shi
DOI:10.1016/s0040-4039(02)01504-6
日期:2002.9
Mukaiyama-type aldol condensation of arylaldehyde acetals occurs smoothly with methyl 3,3-difluoro-2-trimethylsilyloxyacrylate (derived from ethyl 3,3-difluoro-2-benzoylacrylate) when catalyzed by a Lewis acid, allowing preparation of 4-alkyloxy-3,3-difluoro-2-keto esters in high yields.
路易斯酸催化下,与3,3-二氟-2-三甲基甲硅烷基氧基丙烯酸甲酯(衍生自3,3-二氟-2-苯甲酰基丙烯酸乙酯)形成的Mukaiyama型醛缩醛醛醇缩合反应顺利进行,从而制备了4-烷氧基-3 ,3-二氟-2-酮酯的收率很高。