Synthesis of 2,3-Disubstituted Indoles by Palladium-Mediated Coupling of 2-Iodoindoles
作者:Hidetoshi Tokuyama、Yosuke Kaburagi、Xiaoqi Chen、Tohru Fukuyama
DOI:10.1055/s-2000-6354
日期:——
N-Unprotected 2-iodoindoles are synthesized by treatment of 2-stannylindoles with iodine, which in turn are prepared by tin-mediated radical cyclization of 2-alkenylphenylisocyanides. Palladium-catalyzed coupling reactions of N-unprotected 2-iodoindoles with terminal acetylenes, terminal olefins, carbonylation, and the Suzuki coupling reaction with phenyl borate proceed smoothly to furnish the corresponding 2,3-disubstituted indoles in good to excellent yields.
N-未保护的2-碘吲哚通过将2-锡烯吲哚与碘反应合成,这些2-锡烯吲哚又是通过锡催化的自由基环化反应与2-烯基苯异氰酸酯制备的。N-未保护的2-碘吲哚与末端炔烃、末端烯烃的镍催化耦合反应,以及与苯硼酸的铃木耦合反应均顺利进行,生成相应的2,3-二取代吲哚,产率良好至优异。