One-Pot Synthesis of 2,4-Disubstituted Indoles from<i>N</i>-Tosyl-2,3-dichloroaniline Using Palladium–Dihydroxyterphenylphosphine Catalyst
作者:Miyuki Yamaguchi、Kei Manabe
DOI:10.1021/ol500711z
日期:2014.5.2
4-Chloroindoles were synthesized from readily available 2,3-dichloroaniline derivatives and terminal alkynes. The catalyst composed of palladium and dicyclohexyl(dihydroxyterphenyl)phosphine (Cy-DHTP) enabled ortho-selective Sonogashira coupling, and subsequent cyclization afforded 4-chloroindoles in high yields. This transformation was successfully applied to the one-pot synthesis of 2,4-disubstituted indoles via Suzuki-Miyaura coupling after indole formation.