Enantiomeric 2-anilino-2-oxo-1,3,2-oxazaphosphorinanes: Synthesis and NMR-investigation of their non-racemic mixtures
摘要:
Enantiomeric R-(-)- and (S)-(+)-2-anilino-2-oxo-1,3,2-oxazaphosphorinanes (1) have been synthesized by catalytic debenzylation of separated diastereomers of 3-(alpha-methylbenzyl)-2-anilino-2-oxo-1, 3,2-oxazaphosphorinanes. Self-induced diastereomeric anisochronicity in non-racemic mixtures of these enantiomers was shown to vary with enantiomeric composition, overall-specimen concentration, and temperature. The equilibrium constants of monomer-dimer and homo-cross-associate diastereomeric equilibria are estimated for the first time.