Hydrochloric Acid → 2-(3-(4-(3-p-Tolylureido)phenyl)isoxazole-5-carboxamido)acrylic acid

Participants

Reaction Steps

Methyl 2-(3-(4-(3-p-tolylureido)phenyl)isoxazole-5-carboxamido)acrylate (125 mg, 0.298 mmol) was dissolved in THF and water in 2:1 ratio. Lithium hydroxide monohydrate (19 mg, 0.447 mmol) was added and the reaction mixture was stirred at room temperature for 1 hour. 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 60 mg (50%) white solid as the required compound. MS: ES (+): m/z 407(M+1); 1HNMR (DMSO-d6, 300 MHz) δ: 9.732 (s, 1H), 8.989 (s, 1H), 8.714 (s, 1H), 7.894 (d, 2H), 7.784 (s, 1H), 7.638 (d, 2H), 7.377 (d, 2H), 7.121 (d, 2H), 6.232 (s, 1H), 5.921 (s, 1H), 5.918 (s, 3H).

Provenance & Evidence