Asymmetric synthesis of α-alkyl-α-hydroxy-γ-butyrolactones
摘要:
A new enantioselective approach to alpha-alkyl-alpha-hydroxy-gamma-butyrolactones employing (1R,2S)-ephedrine-derived chiral allyl morpholinones as starting materials is described. (C) 1999 Elsevier Science Ltd. All rights reserved.
Enantioselective synthesis of α-hydroxy γ-butyrolactones from an ephedrine-derived morpholine-dione
摘要:
An ephedrine-derived morpholine dione is employed in the enantioselective synthesis of (S)-alpha-hydroxy- gamma,gamma-dimethyl-gamma-butyrolactone and (S)-alpha-hydroxy gamma-butyrolactone. A one-pot alkylation/allylation protocol for the stereoselective conversion of the dione to 2-alkyl-2-allyl morpholinones, key intermediates for alpha-alkyl-alpha-hydroxy-gamma-butyrolactones, is described. (C) 2002 Elsevier Science Ltd. All rights reserved.