Synthesis of multi-substituted pyrroles using enamides and alkynes catalyzed by Pd(OAc)<sub>2</sub>with molecular oxygen as an oxidant
作者:Yun-He Xu、Tao He、Qiu-Chi Zhang、Teck-Peng Loh
DOI:10.1039/c3cc49683j
日期:——
A cyclization reaction between enamides and alkynes catalyzed by palladium(II) acetate is described. In this method, the molecular oxygen serves as an efficient oxidant for the Pd(II)/Pd(0) catalytic cycle. The simple reaction conditions permit this methodology to be used as a general tool for the preparation of multi-substituted pyrroles.
A novel and efficient Fe-catalyzed radical cycloaddition of 2H-azirines and enamides for the synthesis of substituted pyrroles has been developed. The radical cycloaddition reaction proceeded through a conceptually new Fe(II)-catalyzed homolytic cleavage of C–N bond of 2H-azirines sequential radical cyclization with enamides. The reaction used readily available starting materials, tolerated various