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Acetic Acid → 3-Isopropylamino-pyrazole-1-carboxylic acid tert-butyl ester

HRID 419185
Notes
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Reaction equation

HRID 419185 reaction equation
[CH3:1][C:2]([CH3:4])=O.C(O)(=O)C.[C:9]([O:13][C:14]([N:16]1[CH:20]=[CH:19][C:18]([NH2:21])=[N:17]1)=[O:15])([CH3:12])([CH3:11])[CH3:10].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(Cl)Cl>[C:9]([O:13][C:14]([N:16]1[CH:20]=[CH:19][C:18]([NH:21][CH:2]([CH3:4])[CH3:1])=[N:17]1)=[O:15])([CH3:12])([CH3:10])[CH3:11]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 180AcetoneHCID 5049666Sodium triacetoxyborohydrideHCID 51358380tert-Butyl 3-amino-1H-pyrazole-1-carboxylate

Product 1

HCID 579422763-Isopropylamino-pyrazole-1-carboxylic acid tert-butyl ester

Reagents, catalysts & solvents 1

HCID 6344
Dichloromethane
Solvent

Procedure

A mixture of acetone (0.1 mL, 1.4 mmol), acetic acid (0.078 mL, 1.43 mmol) and 3-amino-pyrazole-1-carboxylic acid tert-butyl ester (200 mg, 1.1 mmol) in DCM (5 mL) was stirred at RT for 1 hour. Sodium triacetoxyborohydride (467 mg, 2.2 mmol) was added and the mixture stirred overnight. The mixture was extracted with ethyl acetate, washed with water, dried and concentrated. The residue was purified by flash column to give 3-Isopropylamino-pyrazole-1-carboxylic acid tert-butyl ester.

Workup

  1. stirringthe mixture stirred overnight
  2. extractionThe mixture was extracted with ethyl acetate
  3. washwashed with water
  4. customdried
  5. concentrationconcentrated
  6. customThe residue was purified by flash column

Sources & evidence

ORD record
ord-e4d6b325412d41cc8f96a079b12477d2
Source dataset
uspto-grants-2012_01
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08093247B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes