Enantioselective hydrogenation of β-keto sulfones with chiral Ru(II)-catalysts: synthesis of enantiomerically pure butenolides and γ-butyrolactones
摘要:
A series of beta-hydroxy sulfones were synthesized with high enantioselectivities via a new enantioselective ruthenium-catalyzed hydrogenation using MeO-BIPHEP as a ligand. Some beta-hydroxy sulfones were used in the synthesis of optically active butenolides and gamma-butyrolactones with high yields and enantioselectivities over 95%. (C) 1999 Elsevier Science Ltd. All rights reserved.
A very simple in situ preparation of chiral ruthenium-diphosphine catalysts from anhydrous RuCl3 is reported. Prochiral C=O and C=C bonds have been reduced with high enantioselectivities via ruthenium-catalyzed hydrogenation. (C) 2001 Elsevier Science Ltd. All rights reserved.