A New and Safe Approach to (N-Vinylimino)phosphoranes

Abstract

1-[α-(Phosphoranylideneamino)alkyl]benzotriazoles, obtained by Staudinger phosphenimide-forming reaction of (azidoalkyl)benzotriazoles, possessing a proton in a β-position to nitrogen reacted with sodium hydride in THF to afford (N-vinylimino)phosphoranes in high yields. The latter were trapped with chalcone to give the corresponding 2,4-diphenylpyridines. © 1994, American Chemical Society. All rights reserved.