(S)-4,4-difluoro-2-[(morpholine-4-carbonyl)-amino]-5-phenyl-pentanoic acid methyl ester → (S)-4,4-Difluoro-2-[(morpholine-4-carbonyl)-amino]-5-phenyl-pentanoic acid

Participants

Reaction Steps

To a solution of (S)-4,4-difluoro-2-[(morpholine-4-carbonyl)-amino]-5-phenyl-pentanoic acid methyl ester (2.81 g, 7.88 mmol) in MeOH:H2O (2:1 vol, 40 mL) is added LiOH mono hydrate (662 mg, 15.76 mmol). The mixture is stirred at room temperature for 2.5 h, and then diluted with water (30 mL). Methanol is removed in vacuum. The pH is adjusted to pH 1 with 6N HCl and the aqueous layer is extracted with dichloromethane (2×30 mL). The organic layers are dried over magnesium sulfate and concentrated in vacuum to afford (S)-4,4-Difluoro-2-[(morpholine-4-carbonyl)-amino]-5-phenyl-pentanoic acid (2.509 g, 93%).

Provenance & Evidence