Synthesis of functionalized phosphinines: Aromatization of Diels‐Alder adducts of P‐chlorobis(trimethylsilyl)methylenephosphine

Abstract

The Diels‐Alder adducts of functionalized dienes with P‐chloro‐bis(trimethylsilyl)methylenephosphine can be aromatized, except in a few particular cases, thus opening a general route to functionalized phosphinines. The aromatization procedure differs with the substituents. Intermediates such as secondary cyclic phosphines could be characterized and even isolated. In some cases, aromatization and 1,5 sigmatropic shift of a trimethylsilyl group were observed and hydrogenolysis of the CSi bond as well.