title: Brønsted acid catalyzed α'-functionalization of silylenol ethers with indoles.
abstract: A new method which enables carbon-carbon bond formation at the α'-position of silylenol ethers by using catalytic amounts of pyridinium triflate is reported. This chemistry successfully produces, structurally challenging, highly substituted indole-containing silylenol ethers in excellent yields with complete regiocontrol, presumably through silyloxyallyl cation intermediates. Despite the use of Brønsted acid, the silylenol ether moiety does not undergo protodesilylation, thus underscoring the very mild reaction conditions.
authors.affiliation: Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803 (USA) http://www.chemistry.lsu.edu.
authors.forename: Caitlan E
authors.initials: CE
authors.lastname: Ayala
authors.forename: Nitin S
authors.initials: NS
authors.lastname: Dange
authors.forename: Frank R
authors.initials: FR
authors.lastname: Fronczek
authors.forename: Rendy
authors.initials: R
authors.lastname: Kartika
keywords: Brønsted acid; heterocycles; nucleophilic substitution; oxyallyl cations; silylenol ethers