Direct dehydrative cross-coupling of tautomerizable heterocycles with alkynes via Pd/Cu-catalyzed phosphonium coupling
作者:Fu-An Kang、James C . Lanter、Chaozhong Cai、Zhihua Sui、William V. Murray
DOI:10.1039/b917777a
日期:——
The first chemoselective direct dehydrative cross-coupling of tautomerizable heterocycles with alkynes has been achieved via C–H/C–OH bond activations with direct C(sp2)–C(sp) bond formation, which is in line with ideal synthesis using readily available materials.
Efficient Pd-Catalyzed Coupling of Tautomerizable Heterocycles with Terminal Alkynes via C−OH Bond Activation Using PyBrOP
作者:Ce Shi、Courtney C. Aldrich
DOI:10.1021/ol100657n
日期:2010.5.21
The direct alkynylation of tautomerizable heterocycles is described via a two-step process involving in situ C OH activation with bromotripyrrolidinophosphonium hexafluorophosphate (PyBrOP) followed by Sonogashira coupling with a wide range of alkyl or aryl terminal alkynes using a copper-free system employing PdCl2(CH3CN)(2) and 2-(dicyclohexylphosphino)biphenyl.