Hydrochloric Acid → HCID 71711573, compound

Participants

Reaction Steps

To a solution of [6-fluoro-4-(4-methansulfonyl-phenyl)-3-methyl-naphthalen-2-yl]-acetic acid methyl ester (77.7 mg, 0.2 mmol) in THF (10 mL) was added a solution of lithium hydroxide monohydrate (83.92 mg, 2.0 mmol) in water (2 mL) at room temperature. The resulting clear solution was stirred for 15 hours. The reaction mixture was concentrated to remove THF. The residue was diluted with water (˜30 mL) to obtain a clear solution. The basic aqueous layer was acidified with 1.0 N hydrochloric acid. The precipitated solids were collected by filtration and washed with water and hexanes. After drying in air, [6-fluoro-4-(4-methansulfonyl-phenyl)-3-methyl-naphthalen-2-yl]-acetic acid (65 mg, 87%) was isolated as white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 12.51 (br. s, 1 H), 8.11 (d, J=8.2 Hz, 2 H), 8.02 (dd, J=9.0, 6.0 Hz, 1 H), 7.92 (s, 1 H), 7.54 (d, J=8.2 Hz, 2 H), 7.39 (td, J=9.0, 2.3 Hz, 1 H), 6.71 (dd, J=11.3, 2.3 Hz, 1 H), 3.86 (s, 2 H), 3.35 (s, 3 H), 2.08 (s, 3 H). HRMS calcd. for C20H18FO4S [(M+H)+] 373.0905, obsd. 373.0904.

Provenance & Evidence