efficiently prepared by direct C-3 arylation of indolizines using sodium arylsulfinates and arylsulfonylhydrazides. Pd-catalyzed desulfitative C-3 arylation with sodium arylsulfinates was achieved with the assistance of peroxides, and the catalytic efficiency was promoted by N-containing ligands. Arylsulfonylhydrazides were also successfully applied in Pd-catalyzed desulfitative C-3 arylation with indolizines
Pd-Catalyzed C-3 functionalization of indolizines via C–H bond cleavage
作者:Baoli Zhao
DOI:10.1039/c2ob25643f
日期:——
New transition metal-catalyzed methods for the arylation of indolizines by the direct cleavage of CâH bonds have been developed. A wide range of aryltrifluoroborate salts react with indolizines in the presence of Pd(OAc)2 catalyst and AgOAc oxidant to give the arylated indolizines in high yields. Both electron-donating and electron-withdrawing groups perform smoothly while bromide and chlorine substituents are tolerated. In addition, the indolizines display similar reactivities in the Pd-catalyzed reaction with 3-phenylpropiolic acid to afford the corresponding C-3 alkynylated indolizines. These methods allow the direct functionalization of indolizines in one step.