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.
413. The unsaturation and tautomeric mobility of heterocyclic compounds. Part VI. The mobility of 5-substituted 1-hydroxybenzthiazoles, and the ultra-violet absorption of mobile and static derivatives of 1-hydroxybenzthiazole