Reactivity of antipyrine and haloantipyrines in Pd-catalyzed C H bond arylations
作者:Arpan Sasmal、Jitendra K. Bera、Henri Doucet、Jean-François Soulé
DOI:10.1016/j.tetlet.2020.151798
日期:2020.4
We reported herein the Pd-catalyzed direct arylation of antipyrine using Pd(OAc)2 as catalyst associated with KOAc as inexpensive base. In most cases, diethyl carbonate was used a sustainable solvent. The reaction tolerated a wide range of functional groups on the aryl bromide partners (e.g., nitrile, nitro, chloro, fluoro, formyl, acetyl, propionyl, benzoyl, ester, methyl, methoxy). In addition, some
A mild, efficient and catalytic ligand-free method for the direct arylation of 5-pyrazolones by Pd-catalyzed C-H bond activation is reported. The process smoothly proceeds and yields are moderate to excellent.