Water → HCID 178488172, compound

HRID 1531789Notes

Reaction equation

[CH3:1][O-:2].[Na+].Cl[C:5]1[O:9][N:8]=[C:7]([C:10]2[N:14]3[N:15]=[C:16]([OH:23])[C:17]4[C:22]([C:13]3=[N:12][N:11]=2)=[CH:21][CH:20]=[CH:19][CH:18]=4)[CH:6]=1.O>CN(C)C=O>[OH:23][C:16]1[C:17]2[C:22](=[CH:21][CH:20]=[CH:19][CH:18]=2)[C:13]2=[N:12][N:11]=[C:10]([C:7]3[CH:6]=[C:5]([O:2][CH3:1])[O:9][N:8]=3)[N:14]2[N:15]=1

Participants

Conditions

Temperature: 0 °C

Procedure

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 (5 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 (ES30) 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 (ES30) 438 [MH]+.

Workup

customat 0° C.
customthe solvents evaporated in vacuo
filtrationThe resulting precipitate was filtered off
washwashed with hexane
customazeotroped with ethanol

Sources & evidence

ORD record: ord-66442a55fb7d4f7eb9d5cf70439a9837
Source dataset: uspto-grants-2001_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06200975B1

Reaction notes

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