Enantioselective hydrogenation of isomeric β-acetamido β-alkylacrylates: crucial influence of temperature
摘要:
The hydrogenation of beta-acylaminoacrylate with [((R,R)-Et-BPE)Rh(COD)]BF4 and [((S,S)-Et-Duphos)Rh(COD)]BF4, reveals an important temperature effect. With each ligand, under the best experimental conditions, the beta-acylamino ester 2b was isolated in 93-94% c.e. from a 1: 1 mixture of (E/Z) ethyl beta-acylaminoacrylate 1b. (C) 2003 Elsevier Science Ltd. All rights reserved.
The hydrogenation of beta-acylaminoacrylate with [((R,R)-Et-BPE)Rh(COD)]BF4 and [((S,S)-Et-Duphos)Rh(COD)]BF4, reveals an important temperature effect. With each ligand, under the best experimental conditions, the beta-acylamino ester 2b was isolated in 93-94% c.e. from a 1: 1 mixture of (E/Z) ethyl beta-acylaminoacrylate 1b. (C) 2003 Elsevier Science Ltd. All rights reserved.