Effect of Amines on the Selective Bromination of Some β-Substituted-2-Butenoic Esters
作者:Masahisa Nakada、Ei-Ichi Kojima、Hidehiro Ichinose
DOI:10.1080/00397910008087098
日期:2000.3
Abstract The effect of amines on the selective bromination of some β-substituted-2-butenoic esters is described. The bromination of methyl (Z)-4-t-butyldiphenylsilyloxy-3-methylbutenoate 2 in the presence of DIPEA (N, N-diisopropylethylamine) and the successive treatment of the obtained dibromide with potassium t-butoxide afford the desired Z bromide selectively. But the corresponding E bromide forms
摘要 描述了胺对某些 β-取代-2-丁烯酸酯选择性溴化的影响。(Z)-4-叔丁基二苯基甲硅烷氧基-3-甲基丁烯酸甲酯 2 在 DIPEA (N, N-二异丙基乙胺) 存在下的溴化和所得二溴化物用叔丁醇钾的连续处理选择性地提供所需的溴化 Z。但相应的 E 溴化物仅在溴化中使用 2, 6-二-叔丁基-4-甲基吡啶时形成。