Citric Acid → HCID 59000997, compound

Participants

Reaction Steps

To a 0° C. solution of 4-{[N-((1R)-1-carbamoyl-3-methyl-butyl)-N-(4-chlorobenzenesulfonyl)amino]-methyl}benzoic acid (50.0 mg, 0.114 mmol) in DMF (0.3 mL) was added morpholine (12.9 mg, 0.148 mmol), followed by 1-hydroxybenzotriazole (18.5 mg, 0.137 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (26.2 mg, 0.137 mmol), and iPr2NEt (26 μL, 0.15 mmol). After 2 h, the solution was warmed to rt. After 4 h, the solution was poured into 10% aq. citric acid and extracted with EtOAc (2×). The combined organic layers were washed sequentially with water and sat. aq. NaHCO3, then dried (MgSO4) and concentrated. Flash column chromatography (SiO2, 40 to 100% EtOAc/hexanes) gave the title compound as a white solid (46.0 mg, 79%). MS (ESI), (M+H)+ 508.22; 1H NMR (CDCl3, 300 MHz) δ 7.68 (d, 2H, J=8.6), 7.29-7.47 (m, 6H), 6.38 (br s, 1H), 5.75 (br s, 1H), 4.65 (d, 1H, J=16.0), 4.42 (d, 1H, J=16.0), 4.32 (t, 1H, J=7.5), 3.30-3.85 (br in, 8H), 1.69-1.78 (m, 1H), 1.28-1.37 (m, 1H), 1.08-1.14 (m, 1H), 0.76 (d, 3H, J=6.5), 0.63 (d, 3H, J=6.6).

Provenance & Evidence