Hydrochloric Acid → HCID 86722447, compound

Participants

Reaction Conditions

Reaction Steps

THF (100 mL) was added to a mixture of 7-bromo-1-(4-fluorophenyl)-1H-indazol-6-ol (4.54 g, 14.8 mmol) (97, R1=4-Fluorophenyl) and 3-bromopropionic acid (34.0 g, 222 mmol). The mixture was cooled to about 0° C. NaOH (2 M aqueous solution, 150 mL, 300 mmol) was added over about 15 min. The ice bath was removed. After about 15 h, NaOH (2 M aq. solution, 20.0 mL, 40.0 mmol) was added over about 5 min. 3-Bromopropanoic acid (6.00 g, 39.2 mmol) was added in portions over about 5 min. After about 6 h, NaOH (2 M aq. solution, 20.0 mL, 40.0 mmol) was added over about 5 min. After about 14 h, NaOH (2 M aq. solution, 20.0 mL, 40.0 mmol) was added over about 5 min. After about 2 h, NaOH (2 M aq. solution, 20.0 mL, 40.0 mmol) was added over about 5 min. After about 15 h, the solution was cooled to about 0° C. 2 M aq. HCl (250 mL) and EtOAc (400 mL) were added. The layers were separated and the aqueous layer was extracted with EtOAc (100 mL). The combined organics were washed with water (400 mL) and sat. aq. NaCl (400 mL), dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified on silica gel (220 g) using a gradient of 0-50% EtOAc in DCM. The fractions containing the product were combined and concentrated under reduced pressure to afford a light tan solid. DCM (50 mL) was added. The solid was collected by filtration rinsing with 2×10 mL DCM (2×10 mL) then dried under reduced pressure to afford 3-((7-bromo-1-(4 fluorophenyl)-1H-indazol-6-yl)oxy)propanoic acid (98, R1=4-Fluorophenyl) (7.93 g, 30% yield) as an ivory solid. LC/MS, method 3, Rt=1.97 min, MS m/z 379 and 381 (M+H)+. 1H NMR (400 MHz, DMSO) δ 12.35 (s, 1H), 8.30 (s, 1H), 7.86 (d, J=8.7 Hz, 1H), 7.56-7.46 (m, 2H), 7.39-7.30 (m, 2H), 7.18 (d, J=8.8 Hz, 1H), 4.34 (t, J=6.0 Hz, 2H), 2.72 (t, J=6.0 Hz, 2H).

Provenance & Evidence