New procedures for the enantioselective oxidation of sulfides under stoichiometric and catalytic conditions
摘要:
Acid-catalyzed oxidation of 2-furylcarbinols with hydrogen peroxide affords alternatively 2-(1-hydroperoxyalkyl)furans 2 or 6-hydroperoxy-2H-pyran-3(6H)-ones 3. Compounds of the type 2 and 3 have been used Lis oxygen donors in efficient stoichiometric or catalytic procedures for the asymmetric sulfoxidation of prochiral sulfides in the presence of Ti(O-i-Pr)(4)/L-DET or Ti(O-i-Pr)(4)/(R)-BINOL/H2O systems. Positive non linear effects, (+)-NLE, were observed in the enantioselective oxidation of methyl p-tolyl sulfide, promoted by enantiomierically enriched Ti(IV)/BINOL/H2O complexes. (C) 2002 Elsevier Science Ltd. All rights reserved.
New procedures for the enantioselective oxidation of sulfides under stoichiometric and catalytic conditions
摘要:
Acid-catalyzed oxidation of 2-furylcarbinols with hydrogen peroxide affords alternatively 2-(1-hydroperoxyalkyl)furans 2 or 6-hydroperoxy-2H-pyran-3(6H)-ones 3. Compounds of the type 2 and 3 have been used Lis oxygen donors in efficient stoichiometric or catalytic procedures for the asymmetric sulfoxidation of prochiral sulfides in the presence of Ti(O-i-Pr)(4)/L-DET or Ti(O-i-Pr)(4)/(R)-BINOL/H2O systems. Positive non linear effects, (+)-NLE, were observed in the enantioselective oxidation of methyl p-tolyl sulfide, promoted by enantiomierically enriched Ti(IV)/BINOL/H2O complexes. (C) 2002 Elsevier Science Ltd. All rights reserved.