反应详情

1 g (2R,4S)-5-Biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylpentanoic acid (R1=Boc, R2=H, R3=CO2H) is added to ethanol (10 ml). Sodium methoxide (141 mg) is then added and the mixture is stirred at room temperature for 30 minutes. The mixture is then concentrated in vacuo to afford (2R,4S)-5-biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylpentanoic acid sodium salt (1-a, R1=Boc, R2=H, R3=CO2−Na+). 1H NMR (DMSO-d6): 0.91 (3H), 1.29 (1H), 1.34 (9H), 1.61 (1H), 2.12 (1H), 2.68-2.81 (2H), 3.60 (1H), 7.25-7.27 (2H), 7.32-7.36 (1H), 7.43-7.47 (2H), 7.55-7.57 (2H), 7.64-7.66 (2H), 7.76 (1H).

1. concentrationThe mixture is then concentrated in vacuo