An alternative reaction of ortho-(N-benzylidene)aminophenol with chlorophosphites: formation of 2-(2’-alkoxy)-2-oxo-3-phenyl-5,6-benzo-1,4,2-oxazaphosphorinanes

The reactions of o-(N-benzylidene)aminophenol with ethylene chlorophosphite and diethyl chlorophosphite in CHCl₃ in the absence of an external acceptor of HCl result in the formation of diastereomeric 2-(2’-alkoxy)-2-oxo-3-phenyl-5,6-benzo-1,4,2-oxazaphosphorinanes different in the configurations of phosphorus atoms.