Water → HCID 22046447, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred suspension of 3-methoxy-4-(3-pyrazin-2-yl-ureido)-benzoic acid methyl ester (6.07 g, 20 mmol) in 200 mL 3:1 MeOH:H2O at room temperature under nitrogen was added lithium hydroxide monohydrate (8.4 g, 200 mmol) and the reaction heated to 65 ° C. overnight. The reaction was then cooled to room temperature and most of the methanol removed by rotary evaporation. The remaining suspension was neutralized to pH about 4 with concentrated HCl. The formed precipitate was isolated by filtration and rinsing with H2O and then drying under high vacuum to give the desired acid as a white solid (5.34 g, 93%). 1H-NMR (400 MHz, d6-DMSO) δ 8.89 (br s, 1H), 8.34 (s, 1H), 8.24 (s, 1H), 8.16 (d, 1H), 8.16 (d, 1H), 7.56 (s, 1H), 7.50 (d, 1H), 3.91 (s, 3H)

Provenance & Evidence