Preparation of 1,2-Diaryl(heteroaryl)pyrroles and -3-methylpyrroles from <i>N</i>-Allylbenzotriazole
作者:Alan R. Katritzky、Lianhao Zhang、Jiangchao Yao、Olga V. Denisko
DOI:10.1021/jo000885x
日期:2000.11.1
Numerous 1,2-diaryl(heteroaryl)pyrroles and -3-methylpyrroles were prepared in a two-step procedure from N-allylbenzotriazoles via intramolecular oxidative cyclization in the presence of Pd(II) catalyst.
A new metal-free synthesis of pyrrole from allyl ketone and amine has been established. The reaction proceeds via an thiolative activation of the C–C double bond with dimethyl(methylthio)sulfonium trifluoromethanesulfonate, followed by a nucleophilic ring-opening addition of primary amine to the generated episulfonium intermediate, and then an internal condensation and aromatization. This mild procedure