Reaction of N-Haloamide. XX. Bromo-formyloxylation of α, β-Unsaturated Esters with N, N-Dibromobenzenesulfonamide and Formic Acid
作者:YOSHIO UENO、AKEMI YAMASAKI、HIROMI TERAUCHI、SHOJI TAKEMURA
DOI:10.1248/cpb.22.1646
日期:——
α, β-Unsaturated esters were made to react with N, N-dibromobenzenesulfonamide and formic acid in chloroform to give bromo-formyloxyesters. Methyl acrylate (1a), ethyl crotonate (2a), ethyl trans-cinnamate (3a), methyl tiglate (4a), methyl methacrylate (5a), and methyl phenylacrylate (6a) gave methyl 2-bromo-3-formyloxypropionate (1b), ethyl erythro-2-bromo-3-formyloxybutyrate (2b), ethyl erythro-2-bromo-3-formyloxy-3-phenylpropionate (3b), methyl erythro-2-bromo-3-formyloxy-2-methylbutyrate (4b), a mixture of methyl 3-bromo-2-formyloxy-2-methylpropionate (5b) and methyl 2-bromo-3-formyloxy-2-methylpropionate (5c), and methyl 3-bromo-2-formyloxy-2-phenylpropionate (6b) respectively in good yields.
α, β-不饱和酯与N, N-二溴苯磺酰胺和甲酸在氯仿中反应,生成溴代甲酰氧基酯。甲基丙烯酸酯(1a)、乙基巴豆酸酯(2a)、乙基反式肉桂酸酯(3a)、甲基惕格酸酯(4a)、甲基甲基丙烯酸酯(5a)和甲基苯基丙烯酸酯(6a)分别以良好的产率生成甲基2-溴-3-甲酰氧基丙酸酯(1b)、乙基erythro-2-溴-3-甲酰氧基丁酸酯(2b)、乙基erythro-2-溴-3-甲酰氧基-3-苯基丙酸酯(3b)、甲基erythro-2-溴-3-甲酰氧基-2-甲基丁酸酯(4b)、甲基3-溴-2-甲酰氧基-2-甲基丙酸酯(5b)和甲基2-溴-3-甲酰氧基-2-甲基丙酸酯(5c)的混合物以及甲基3-溴-2-甲酰氧基-2-苯基丙酸酯(6b)。