Sodium Hydroxide → HCID 58551116, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of methyl 2-(1-methylspiro[chromeno[4,3-c]pyrazole-4,4′-piperidine]-1′-carbonyl)benzoate (500 mg, 1.17 mmol), NaOH (5.0 mL of 1.0 M, 5.0 mmol), and 1,4-dioxane (5 mL) was heated at 80° C. for 1.5 h. The mixture was cooled to rt before it was concentrated in vacuo. The solid residue was taken up in water and was washed with ethyl acetate which was discarded. The aqueous layer was acidified with 1N HCl and was extracted with ethyl acetate (2×). The combined organics were washed with brine, dried over sodium sulfate, and were concentrated in vacuo to give 2-(1-methylspiro[chromeno[4,3-c]pyrazole-4,4′-piperidine]-1′-carbonyl)benzoic acid (33 mg, 75%) as a white solid. ESI-MS m/z calc. 403.2, found 404.2 (M+1)+; Retention time: 2.31 minutes (3 min run). 1H NMR (400 MHz, DMSO) δ 13.22 (s, 1H), 7.93 (d, J=7.7 Hz, 1H), 7.73 (d, J=7.6 Hz, 1H), 7.65 (t, J=7.4 Hz, 1H), 7.52 (t, J=7.6 Hz, 1H), 7.36 (br s, 2H), 7.28 (t, J=7.7 Hz, 1H), 7.08 (dd, J=13.8, 6.3 Hz, 2H), 4.39 (br s, 1H), 4.10 (s, 3H), 3.30-3.12 (m, 2H), 2.05-1.86 (m, 4H), 1.85-1.74 (m, 1H).

Provenance & Evidence