Domino Reactions of 1,3-Bis(silyl enol ethers) with 4-(Trialkylsilyloxy)benzopyrylium Triflates

Peter Langer

doi:10.1055/s-2007-973894

ACCOUNT

Domino Reactions of 1,3-Bis(silyl enol ethers) with 4-(Trialkylsilyloxy)benzopyrylium Triflates

Peter Langer*^a,b
^a Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
Fax: +49(381)4986412; e-Mail: peter.langer@uni-rostock.de;
^b Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany

Abstract

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Abstract

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

1 Introduction
2 Reaction of 1,3-Bis(silyl enol ethers) with Chromones
3 Reaction of 1,3-Bis(silyl enol ethers) with 3-Cyanochromones
4 Reaction of 1,3-Bis(silyl enol ethers) with 3-Formylchromones
5 Conclusions

Keywords

cyclizations - domino reactions - heterocycles - pyrylium salts - silyl enol ethers

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