Water → HCID 178488172, compound

Participants

Reaction Conditions

Reaction Steps

Sodium methoxide (165 mg, 0.3 mmol) was added to a stirred suspension of 3-(5-chloroisoxazol-3-yl)-6-hydroxy-1,2,4-triazolo[3,4-a]phthalazine (400 mg, 0.14 mmol) (prepared from Intermediate 7 using the procedure described in Example 15 part b) in N,N-dimethylformamide (20 ml) at 0° C. under nitrogen. The mixture was stirred at 0° C. for 3 h then water was added (6 ml) and the solvents evaporated in vacuo. The residue was taken up in water and acidified to pH 2 using 2M hydrochloric acid. The resulting precipitate was filtered off, washed with hexane and azeotroped with ethanol to give crude 6-hydroxy-3(5-methoxyisoxazol-3-yl)-1,2,4-triazolo[3,4-a]phthalazine, MS (ES+) 284 [MH]+. The title-compound was prepared from this material using the procedure described in Example 103 part a, 1H NMR (250 MHz, CDCl3) δ 2.49 (3H, s, CH3), 4.15 (3H, s, CH3), 6.10 (1H, s, Ar—H), 7.45 (2H, d, J=8.5 Hz, Ar—H), 7.92 (1H, m, Ar—H), 8.06 (1H, m, Ar—H), 8.26-8.32 (3H, m, 3 of Ar—H), 8.64 (1H, d, Ar—H); MS (ES+) 438 [MH]+.

Provenance & Evidence