Butanoic acid, 2-[(3-nitrophenyl)methylene]-3-oxo-, 1-methylethyl ester → 1,2,4,7-Tetrahydro-5-methyl-7-(3-nitrophenyl)-2-oxopyrazolo[1,5-a]pyrimdine-6-carboxylic acid, 1-methylethyl ester

HRID 1252990Notes

Reaction equation

[NH2:1][C:2]1[N:3]=[N:4][C:5](=[O:7])[CH:6]=1.[N+:8]([C:11]1[CH:12]=[C:13]([CH:17]=[C:18]([C:25](=O)[CH3:26])[C:19]([O:21][CH:22]([CH3:24])[CH3:23])=[O:20])[CH:14]=[CH:15][CH:16]=1)([O-:10])=[O:9]>CN(C)C=O.CCOCC>[CH3:26][C:25]1[NH:1][C:2]2[N:3]([NH:4][C:5](=[O:7])[CH:6]=2)[CH:17]([C:13]2[CH:14]=[CH:15][CH:16]=[C:11]([N+:8]([O-:10])=[O:9])[CH:12]=2)[C:18]=1[C:19]([O:21][CH:22]([CH3:23])[CH3:24])=[O:20]

Participants

Conditions

Temperature: 70 °C

Procedure

A mixture of 3-amino-5-pyrazolone (3.57 g; 36.1 mmole) and 2-[(3-nitrophenyl)methylene]-3-oxobutanoic acid, 1-methylethyl ester (10.0 g; 36.1 mmole) in dry dimethylformamide (30 ml) was heated at 70° C. under argon for 24 hours. The reaction mixture was allowed to cool to room temperature and then diluted with ether. The resultant precipitate was filtered off and recrystallized from isopropanol to provide the title compound in crystalline form (4.23 g; melting point 254°-256° C.).

Workup

temperatureto cool to room temperature
filtrationThe resultant precipitate was filtered off
customrecrystallized from isopropanol

Sources & evidence

ORD record: ord-40380c51587d4d338d8a63f849d3fef3
Source dataset: uspto-grants-1988_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04746656

Reaction notes

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