Preparation of Partially Substituted 1-Halo- and 1,4-Dihalo-1,3-dienes via Reagent-Controlled Desilylation of Halogenated 1,3-Dienes
作者:Zhenfeng Xi、Zhiyi Song、Guangzhen Liu、Xiaozhong Liu、Tamotsu Takahashi
DOI:10.1021/jo060003f
日期:2006.4.1
3-butadienes afforded either 1-halo-1-trimethylsilyl-1,3-butadienes or 1-halo-4-trimethylsilyl-1,3-butadienes in excellent yields with excellent selectivity, respectively, when treated with CF3COOH or with NaOMe. These monosilylated 1,3-butadiene products could be further desilylated to generate their corresponding halobutadienes via the above reagent-controlled desilylation reaction. When 1,4-dihalo-1
取决于所使用的脱甲硅烷基化试剂,1-卤代-1,4-双(三甲基甲硅烷基)-1,3-丁二烯提供1-卤代-1-三甲基甲硅烷基-1,3-丁二烯或1-卤代-4-三甲基甲硅烷基-1当用CF 3 COOH或NaOMe处理时,分别以优异的收率和优异的选择性获得3,3-丁二烯。这些单甲硅烷基化的1,3-丁二烯产物可以通过上述试剂控制的甲硅烷基化反应进一步被甲硅烷基化以产生其相应的卤代丁二烯。当在室温下用MeONa / MeOH处理1,4-二卤代-1,4-双(三甲基甲硅烷基)-1,3-二烯时,两个三甲基甲硅烷基均发生甲硅烷基化反应,得到相应的1,4-二卤代-1,3-二烯的收率极好。常用的去甲硅烷基化试剂CF 3 COOH不适用于这些二卤双丁二烯。