Cl.[C:2]([C:6]1[CH:10]=[C:9]([NH2:11])[N:8]([CH:12]2[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]2)[N:7]=1)([CH3:5])([CH3:4])[CH3:3].C(=O)([O-])[O-].[K+].[K+].Cl[C:25]([O:27][C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1)=[O:26].C(N(CC)C(C)C)(C)C>C1COCC1>[C:2]([C:6]1[CH:10]=[C:9]([NH:11][C:25](=[O:26])[O:27][C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)[N:8]([CH:12]2[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]2)[N:7]=1)([CH3:5])([CH3:3])[CH3:4]To a stirred mixture of 3-tert-butyl-1-cyclohexyl-1H-pyrazol-5-amine hydrochloride (260 mg, 1 mmol) and potassium carbonate (210 mg, 1.5 mmol) in THF (3 mL) at rt, was added dropwise a solution of phenyl chloroformate (170 mg, 1.1 mmol) in THF (2 mL) and the reaction mixture was stirred for a further 15 h. N,N-Diisopropylethylamine (129 mg, 1 mmol) was added to the reaction mixture and stirring continued for an additional 4 h. The reaction mixture was filtrated, the filtrate concentrated under reduced pressure and the residue partitioned between dichloromethane and water. The organic layer was separated and washed with brine, then concentrated under reduced pressure to give a solid which was recrystallized from diethyl ether to afford crude phenyl 3-tert-butyl-1-cyclohexyl-1H-pyrazol-5-ylcarbamate (200 mg) which was used without further purification. LC-MS (ESI) m/z 342 (M+H)+.
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