5-Ethyl-6-oxo-4-thioxo-1,3,2-oxazaphospholidino[3,2-a][1,3,2]benzodiazaphosphorine

Abstract

The title fused tricyclic phospho­roheterocycle, C11H13N2O2PS, was unexpectedly synthesized by the reaction of a multifunctional compound, 2-[N-(2′-hydroxy)­ethyl]­amino-N′-ethyl­benz­amide, with tris­(diethyl­amino)­phosphine in the presence of iodine as catalyst. The crystallographic data analysis reveals that the title compound is triclinic with space group P\overline 1 and there are three rings in the mol­ecule. The phenyl ring, the two N atoms and the carbonyl C atom are coplanar; the P atom and the carbonyl C atom deviate by −0.692 (2) and 0.1116 (13) Å, respectively, from the phenyl ring plane. The five-membered ring exists in an boat conformation.