Abstract Simple N??heterocycles were converted to N??phosphono??and phosphinoxidomethyl derivatives by a solvent??free microwave??assisted condensation of the heterocycle, paraformaldehyde, and diethylphosphite or diphenylphosphine oxide in a convenient and, in most cases, efficient way. In contrast to an earlier report, imidazole proved to be unreactive in this type of phospha??Mannich reaction.
