Methyl iodide → 5,6-dihydro-6-methyl-1,5-dioxo-1H-pyrazolo[1,2-a][1,2,4]benzotriazine-2-carboxylic acid, ethyl ester

HRID 443495Notes

Reaction equation

HRID 443495 reaction equation
[O:1]=[C:2]1[N:6]2[C:7]3[CH:15]=[CH:14][CH:13]=[CH:12][C:8]=3[NH:9][C:10](=[O:11])[N:5]2[CH:4]=[C:3]1[C:16]([O:18][CH2:19][CH3:20])=[O:17].[C:21]([O-])([O-])=O.[K+].[K+].CI>CN(C)C=O>[CH3:21][N:9]1[C:8]2[CH:12]=[CH:13][CH:14]=[CH:15][C:7]=2[N:6]2[C:2](=[O:1])[C:3]([C:16]([O:18][CH2:19][CH3:20])=[O:17])=[CH:4][N:5]2[C:10]1=[O:11]

Participants

5

Reactant 3

HCID 6328Methyl iodideHCID 11430Potassium CarbonateHCID 867376765,6-dihydro-1,5-dioxo-1H-pyrazolo[1,2-a][1,2,4]benzotriazine-2-carboxylic acid, ethyl ester

Product 1

HCID 867376785,6-dihydro-6-methyl-1,5-dioxo-1H-pyrazolo[1,2-a][1,2,4]benzotriazine-2-carboxylic acid, ethyl ester

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

5.22 g 5,6-dihydro-1,5-dioxo-1H-pyrazolo[1,2-a][1,2,4]benzotriazine-2-carboxylic acid, ethyl ester, made as in Example 1, 2.76 g K2CO3 and 50 mM CH3I are dissolved in 100 ml dimethylformamide and stirred for 20 hours. The crystalline 5,6-dihydro-6-methyl-1,5-dioxo-1H-pyrazolo[1,2-a][1,2,4]benzotriazine-2-carboxylic acid, ethyl ester is isolated after filtration and recrystallized from dimethylformamide/ethanol. The yield is 4.7 g as white needles with a melting point of 243°-244° C.

Sources & evidence

ORD record
ord-4b3ac266d03f43ab8bfd22f8729ba000
Source dataset
uspto-grants-1981_04
Patent number
US04260751

Reaction notes

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