Hydrochloric Acid → [4-nitro-2-(2-trimethylsilanyl-ethoxymethyl)-2H-pyrazol-3-yl]methanol
Reaction equation
[N+:1]([C:4]1[CH:8]=[N:7][N:6]([CH2:9][O:10][CH2:11][CH2:12][Si:13]([CH3:16])([CH3:15])[CH3:14])[C:5]=1[C:17](OCC)=[O:18])([O-:3])=[O:2].[BH4-].[Na+].[Cl-].[NH4+].Cl>C(OCC)(=O)C.CO>[N+:1]([C:4]1[CH:8]=[N:7][N:6]([CH2:9][O:10][CH2:11][CH2:12][Si:13]([CH3:14])([CH3:15])[CH3:16])[C:5]=1[CH2:17][OH:18])([O-:3])=[O:2]Participants
Reactant 4
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- 0 °C
Procedure
To a 0° C. solution of 4-nitro-2-(2-trimethylsilanyl-ethoxymethyl)-2H-pyrazole-3-carboxylic acid, ethyl ester (10 g, 31.7 mmol) in tetrahydroftiran (200 mL) was added methanol (24 mL) followed by sodium borohydride (9.59 g, 8 eq) in one portion. The resulting mixture was stirred at 0° C. for 20 minutes. The reaction mixture was then added to a mixture of saturated aqueous ammonium chloride solution (600 mL) and ethyl acetate (800 mL) in an ice-bath. A solution of 4 N HCl was added with stirring at 0° C. to adjust the pH of the aqueous layer to about 4. The organic layer was separated and washed with brine (1×500 mL), dried over magnesium sulfate, filtered and concentrated to give the title compound (7.76 g) as a reddish oil. M+=273.
Workup
- stirringwith stirring at 0° C.
- customThe organic layer was separated
- washwashed with brine (1×500 mL)
- dry with materialdried over magnesium sulfate
- filtrationfiltered
- concentrationconcentrated
Sources & evidence
- ORD record
- ord-fae983a8a1d748e591553959eaea0907
- Source dataset
- uspto-grants-2008_10
- Patent number
- US07435731B2
Reaction notes
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