Palladium-Catalyzed Coupling of 3-Indolyl Triflate. Syntheses of 3-Vinyl and 3-Alkynylindoles
摘要:
Palladium-catalyzed coupling of 1 -(phenylsulfonyl)indol-3-yl trifluoromethanesulfonate (triflate) (1) with terminal alkenes and alkenes gives 3-vinyl (2) and 3-alkynylindoles in 45-93% yields. An attempt to generate 2,3-indolyne 22 from 2-trimethylsilyl-3-indolyl triflate 20 gives indigo (23).