Synthesis of Chiral 1,4,2-Oxazaphosphorinanes Bearing Pyridyl Substituents

A series of 1,4,2-oxazaphosphorinanes was synthesized by the three-component reaction of chiral pyridylcontaining imines with trialkyl phosphites and monochloroacetic acid, followed by dealkylation of the P(O)OAlk-fragments of intermediates. It was established that the major diastereomers of the obtained heterocycles have the same configuration at both chiral centers. The synthesized 1,4,2-oxazaphosphorinanes show catalytic activity in the Friedel–Crafts reaction.