Potassium Carbonate → phenyl 3-tert-butyl-1-methyl-1H-pyrazol-5-ylcarbamate

HRID 631464Notes

Reaction equation

HRID 631464 reaction equation
[C:1]([C:5]1[CH:9]=[C:8]([NH2:10])[N:7]([CH3:11])[N:6]=1)([CH3:4])([CH3:3])[CH3:2].C([O-])([O-])=O.[K+].[K+].Cl[C:19]([O:21][C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1)=[O:20]>C1COCC1>[C:1]([C:5]1[CH:9]=[C:8]([NH:10][C:19](=[O:20])[O:21][C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=2)[N:7]([CH3:11])[N:6]=1)([CH3:4])([CH3:2])[CH3:3]

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 15891Phenyl chloroformateHCID 27352873-tert-Butyl-1-methyl-1H-pyrazol-5-amine

Product 1

HCID 46196890phenyl 3-tert-butyl-1-methyl-1H-pyrazol-5-ylcarbamateYield 31%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

According to the procedure described in Example 161C, to a suspension of 3-tert-butyl-1-methyl-1H-pyrazol-5-amine (1.0 g, 6.5 mmol) and K2CO3 (1.17 g, 8.5 mmol) in THF (15 mL) was added phenyl chloroformate (1.12 g, 7.2 mmol). The crude product was purified by silica gel chromatography with 0-50% EtOAc/hexane as eluants to afford phenyl 3-tert-butyl-1-methyl-1H-pyrazol-5-ylcarbamate as solid (0.53 g, 31%). 1H NMR (300 MHz, DMSO-d6) δ 10.2 (s, 1H), 7.43 (m, 2H), 7.25 (m, 3H), 6.06 (s, 1H), 3.66 (s, 3H), 1.25 (s, 9H); LC-MS (ESI) m/z 274 (M+H)+.

Workup

  1. customThe crude product was purified by silica gel chromatography with 0-50% EtOAc/hexane as eluants

Sources & evidence

ORD record
ord-8eb8acc708c8409397f3f4768be09925
Source dataset
uspto-grants-2016_04
Patent number
US09320739B2

Reaction notes

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