Mixing readily available alkynes, pyrroles, and triethylsilane along with an indium catalyst was found to be an efficient procedure to introduce alkyl groups onto a β-position of pyrroles in a complete regioselective manner. This is the first demonstration of catalytic β-alkylation of pyrroles in a single step.
Metal-Free Regioselective β-Alkylation of Pyrroles with Carbonyl Compounds and Hydrosilanes: Use of a Brønsted Acid as a Catalyst
作者:Shota Nomiyama、Teruhisa Tsuchimoto
DOI:10.1002/adsc.201400497
日期:2014.12.15
AbstractA Brønsted acid, trifluoromethanesulfonimide [HN(SO2CF3)2], was found to catalyze reductive β‐alkylation of pyrroles with carbonyl compounds and hydrosilanes. This metal‐free process features lower catalyst loadings compared to the original indium variant and exclusive generation of β‐alkylpyrroles.magnified image