Carbon-carbon bond formation via a tandem cationic 2-aza-Cope rearrangement-Lewis acid promoted Petasis reaction

摘要

Potassium alkynyltrifluoroborates and potassium (2-phenyl)vinyltrifluoroborates react with N-3-butenyl-(2,2-dichloro-1-propylidene)amine in the presence of BF3 center dot Et2O as a Lewis acid to synthesize rearranged Mannich products. The reaction starts with a cationic 2-aza-Cope rearrangement of the imine, followed by the Lewis acid promoted borono-Mannich-type reaction on the rearranged imine to result in a new class of functionalized N-homoallylamines. (c) 2008 Elsevier Ltd. All rights reserved.