1,2,3,4,5,6-Hexahydrophosphinine 1-oxides with an exocyclic P-function at position 3: diastereoselective synthesis, stereostructure and conformation

Catalytic hydrogenation of 3-substituted 1,2-dihydrophosphinine oxides (e.g., 1a and 3b) gave the title compounds as exclusive or major diastereomers (e.g., 4a and 6b-1, respectively).