Facile One-Pot Synthesis of Novel Tricyclic Dibenzoheterocycles via the Dianion Protocol of Ditopic Ligands

In our ongoing studies on the synthesis of new heterocyclic ring systems via a dianion intermediate, we herein describe the preparation of novel dibenzoazadioxoninone, dibenzoazadioxoninethione, dibenzoazadioxocine, dibenzoazadioxacycloundecine, dibenzoazadioxacyclododecine, dibenzoaza-2-oxodioxaphosphonine, and dibenzoaza-2-oxo-1,3-thioxaphosphonine in good yields.