Hydrochloric Acid → HCID 136011268, compound

Participants

Reaction Steps

To a solution of 3-[3-(4-fluorophenyl)-1-perhydro-2H-pyran-2-yl-1H-indazol-5-yl]-1,2,4-oxadiazolin-5-one (88 mg, 0.23 mmol) in dioxane (4.0 mL) was added 6 N HCl (4.0 mL) at ambient temperature. After stirring for 16 h an additional amount of dioxane (1.0 mL) was added and the reaction mixture was gently heated in a 60° C. oil bath for 4 h after which an additional amount of 6 N HCl (1.0 mL) and several drops of methanol were added and after an additional 4 h of heating the reaction was stopped by slowly pouring into vigorously stirred aqueous 6 N NaOH (6.0 mL). The solution was adjusted to pH=8 with the addition of 4 N HCl and extracted with ethyl acetate. The organic layer was washed with brine, dried over MgSO4 and concentrated in vacuo to give a pale orange solid which was purified by flash chromatography on silica gel eluting with 10% methanol in dichloromethane to give a pale yellow solid which was dissolved in a minimum amount of methanol and precipitated with ethyl ether and hexanes to afford the desired product as a pale powder (13 mg, 19% yield) 1H NMR (DMSO-d6): δ 13.6 (s, 1H), 13.0 (br s, 1H), 8.5 (s, 1H), 8.1–8.0 (m, 2H), 7.8 (q, 2H), 7.3 (t, 2H); ES-MS (m/z) 297 [M+H]+.

Provenance & Evidence