A New P-Chiral Aminophosphine Ligand Containing a 2,2'-Coupled Pyrrolidine-Phospholane Ring System. Synthesis and Coordination Properties with Rodium(I) and Iridium(I) Fragments

A new approach to the synthesis of chiral P,N-ligands containing a stereogenic phosphorus atom is reported; the synthesis, characterization and coordination properties of (PR, 2R, 3R, 2'R, 3'S, 4'S) 2[2'(3',4'-di-tert-butoxy-1'-methyltetrahydropyrrolyl)]-3-methoxy-1-phenyltetrahydrophosphole (P*-N-1), which contains a stereogenic phosphorus in addition to five contiguous stereocentres in the ligand backbone; compound P*-N-1 represents the first example of a new class of chiral P,N-ligands with the heteroatoms incorporated in two 2,2'-coupled pyrrolidine-phospholane rings.