First totally diastereoselective opening of chiral triquinphosphoranes. A new access to enantiopure oxazaphospholidines

Asymmetric addition of isocyanate compounds on chiral triquinphosphoranes, tricyclic hydridophosphoranes, led by a total diastereoselective opening of the diazaphospholidine ring. This provides chiral bicyclic oxazaphospholid ines in which an eight-membered ring is fused to the oxazaphospholidine rin g by the P-N bond.