An Effective Deracemization of trans-1,2-Bis (phenylsulfenyl)cyclohexane
摘要:
A chiral S,S-donating C2-symmetric ligand containing two stereogenic centers was prepared from rac-trans-1,2-cyclohexanediol. An effective deracemization of trans-1,2-bis(phenylsulfenyl)cyclohexane was achieved by the catalyzed enantioselective sulfoxidation, followed by the chromatographic separation of diastereomeric mono- and bis-sulfoxides. Subsequent recrystallization of enantiomerically enriched bissulfoxide and its final deoxygenation gave optically pure (1R,2R)-bis(phenylsulfenyl)cyclohexane.