Copper-Promoted Cycloaddition of α-Methylenyl Isocyanides with Benzothiazoles: Tunable Access to Benzo[<i>d</i>]imidazothiazoles
作者:Jian Wang、Jing Li、Qiang Zhu
DOI:10.1021/acs.orglett.5b02694
日期:2015.11.6
benzothiazoles. When the C2 position of benzothiazole is linked to a C–H or C–C bond, benzo[d]imidazo[2,1-b]thiazoles are obtained through a novel rearrangement via C–S bond cleavage and formation of a new C–S bond. When 2-chloro- or 2-bromobenzothiazoles are used under the same reaction conditions, the isomeric benzo[d]imidazo[5,1-b]thiazoles are formed selectively. These reactions proceed smoothly in moderate
通过α-亚甲基异氰化物与苯并噻唑的铜促进的环加成反应,已开发出可调谐途径生成苯并[ d ]咪唑并噻唑的两种异构体。当苯并噻唑的C2位置与C–H或C–C键相连时,通过C–S键的裂解和新C的形成,通过新颖的重排可以获得苯并[ d ]咪唑基[2,1- b ]噻唑–S键。当在相同反应条件下使用2-氯-或2-溴苯并噻唑时,选择性地形成异构体苯并[ d ]咪唑并[5,1- b ]噻唑。这些反应在室温下以中等至极好的收率顺利进行,并且可以容忍各种官能团。