A New and Safe Approach to (N-Vinylimino)phosphoranes
摘要:
1-[alpha-(Phosphoranylideneamino)alkyl] benzotriazoles, obtained by Staudinger phosphenimide-forming reaction of (azidoalkyl)benzotriazoles, possessing a proton in a beta-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.