Abstract: 4-(Silyloxy)benzopyrylium triflates can be readily generated in situ by reaction of chromones with trialkylsilyl-trifluoromethanesulfonate. Domino reactions of bis(silyl enol ethers) with such benzopyrylium triflates – derived from chromones, 3-cyanochromones and 3-formylchromones – allow for an efficient synthesis of a variety of carbo- and heterocycles.

Review: Synlett 2007, 1016-1025.

Period of investigation: 2001 - 2011

Keywords: silyl enol ethers; chromones; heterocycles