Synthesis of 2-substituted 2H-chromenes using potassium vinyltrifluoroborates

Tetrahedron Lett. 2008 Mar 3;49(10):1578-1581. doi: 10.1016/j.tetlet.2008.01.008.

Abstract

2H-Chromenes were synthesized from salicylaldehyde using potassium vinylic borates in the presence of secondary amines. We synthesized these 2H-chromene derivatives as a part of an ongoing project to develop inhibitors for TGF-β receptors. Potassium vinyl trifluoroborates react with salicylaldehydes at 80 °C in the presence of a secondary amine and produced 2-substituted 2H-chromene derivatives with a 70-90% yield.