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)。