Hydrazine hydrate (1:1) → 3-amino-1H-indazole-6-carboxylic Acid
Reaction equation
[C:1]([C:3]1[CH:11]=[CH:10][C:6]([C:7]([OH:9])=[O:8])=[CH:5][C:4]=1F)#[N:2].O.[NH2:14][NH2:15]>C(O)CCC>[NH2:2][C:1]1[C:3]2[C:4](=[CH:5][C:6]([C:7]([OH:9])=[O:8])=[CH:10][CH:11]=2)[NH:15][N:14]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 110 °C
Procedure
To a solution of 4-cyano-3-fluorobenzoic acid (500 mg, 3.0 mmol) in n-butanol (9 mL) was added hydrazine monohydrate (0.5 mL, 10 mmol). The reaction was heated to 110° C. overnight. The reaction was cooled to room temperature and the precipitate was collected by filtration. The solid was then dissolved in 1 N aqueous sodium hydroxide (2 mL) and extracted with ethyl acetate (2×). The aqueous layer was acidified to pH=4 with 1 N aqueous hydrochloric acid. The resulting precipitate was collected by filtration and dried under vacuum to provide the title compound (140 mg, 26%) as a red solid. +ESI (M+H) 178.2; 1H NMR (400 MHz, CD3OD, δ): 7.99-8.01 (m, 1H), 7.73 (dd, J=8.4, 0.8 Hz, 1H), 7.61 (dd, J=8.5, 1.3 Hz, 1H).
Workup
- temperatureThe reaction was cooled to room temperature
- filtrationthe precipitate was collected by filtration
- dissolutionThe solid was then dissolved in 1 N aqueous sodium hydroxide (2 mL)
- extractionextracted with ethyl acetate (2×)
- filtrationThe resulting precipitate was collected by filtration
- customdried under vacuum
Sources & evidence
- ORD record
- ord-d0a8a5ee381640d9bb735577ef00c641
- Source dataset
- uspto-grants-2014_10
- Patent number
- US08859773B2
Reaction notes
Loading…