Ammonium Chloride → tert-butyl (+/-)-4-(4-amino-1-(2,2,2-trifluoroethyl)-1H-pyrazol-5-yl)-2-methylpiperazine-1-carboxylate

HRID 1915896Notes

Reaction equation

HRID 1915896 reaction equation
[CH3:1][CH:2]1[CH2:7][N:6]([C:8]2[N:12]([CH2:13][C:14]([F:17])([F:16])[F:15])[N:11]=[CH:10][C:9]=2[N+:18]([O-])=O)[CH2:5][CH2:4][N:3]1[C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22].[NH4+].[Cl-]>CO.O.[Zn]>[NH2:18][C:9]1[CH:10]=[N:11][N:12]([CH2:13][C:14]([F:16])([F:17])[F:15])[C:8]=1[N:6]1[CH2:5][CH2:4][N:3]([C:21]([O:23][C:24]([CH3:27])([CH3:25])[CH3:26])=[O:22])[CH:2]([CH3:1])[CH2:7]1

Participants

6

Reactant 2

HCID 25517Ammonium ChlorideHCID 86680103(+/-) tert-butyl 2-methyl-4-(4-nitro-1-(2,2,2-trifluoroethyl)-1H-pyrazol-5-yl)piperazine-1-carboxylate

Product 1

HCID 86680104tert-butyl (+/-)-4-(4-amino-1-(2,2,2-trifluoroethyl)-1H-pyrazol-5-yl)-2-methylpiperazine-1-carboxylateYield 88%

Reagents, catalysts & solvents 3

HCID 23994ZincCatalystHCID 887MethanolSolventHCID 962WaterSolvent

Procedure

To a solution of (±) tert-butyl 2-methyl-4-(4-nitro-1-(2,2,2-trifluoroethyl)-1H-pyrazol-5-yl)piperazine-1-carboxylate (370 mg, 0.94 mmol) in MeOH (15 mL) and H2O (3 mL) was added zinc (362 mg, 5.6 mmol) and NH4Cl (400 mg, 7.5 mmol). The reaction mixture was stirred at ambient temperature for 4 hours, filtered through Celite, and evaporated under reduced pressure to afford tert-butyl (±)-4-(4-amino-1-(2,2,2-trifluoroethyl)-1H-pyrazol-5-yl)-2-methylpiperazine-1-carboxylate as yellow solid (300 mg, 88%). MS (ESI) m/z: 364 [M+H+].

Workup

  1. filtrationfiltered through Celite
  2. customevaporated under reduced pressure

Sources & evidence

ORD record
ord-2af3301459c04334b1a2afaa69365502
Source dataset
uspto-grants-2013_12
Patent number
US08614206B2

Reaction notes

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