Hydrochloric Acid → (S)-2-(3-(4-(3-(2-Fluorophenyl)ureido)phenyl)isoxazole-5-carboxamido)-3-hydroxypropanoic acid

Participants

Reaction Steps

(S)-methyl 2-(3-(4-(3-(2-fluorophenyl)ureido)phenyl)isoxazole-5-carboxamido)-3-hydroxypropanoate (compound of Example 275, 200 mg, 0.452 mmol) was dissolved in THF and water in 2:1 ratio. Lithium hydroxide monohydrate (29 mg, 0.678 mmol) was added and the reaction mixture was stirred at RT for 4 hours. The reaction mixture was acidified with dilute HCl and extracted with EtOAc. Organic layer was separated, dried over Na2SO4 and concentrated under reduced pressure. Crude compound was purified by washing with methanol to get 85 mg (44%) of the title compound. MS: ES (−): m/z 427 (M−1); ES (+): m/z 429(M+1); 1HNMR (DMSO-d6, 300 MHz): δ 9.377 (s, 1H), 8.885 (d, 1H), 8.701 (s, 1H), 8.178 (t, 1H), 7.892 (d, 2H), 7.692 (s, 1H), 7.641 (d, 2H), 7.289 (m, 1H), 7.188 (t, 1H), 7.066 (m, 1H), 4.492 (m, 1H), 3.868 (m, 2H), 3.554 (m, 1H), 3.087 (s, 3H).

Provenance & Evidence