Diisopropylethylamine → 1-cyclopropyl-5-trifluoromethyl-1H-pyrazole-4-carboxylic acid (5-hydroxy-adamantan-2-yl)-amide

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Reaction Steps

1-Cyclopropyl-5-trifluoromethyl-1H-pyrazole-4-carboxylic acid (Intermediate 6, 100 mg, 0.45 mmol) was dissolved in a mixture of dry dichloromethane (4 mL) and dry DMF (1 mL). DIPEA (0.5 mL, 2.9 mmol) and TSTU (165 mg, 0.5 mmol) were added to the above mixture. After the mixture was stirred for 2 h, the appearance of active ester was detected by LC-MS. Then 4-amino-adamantan-1-ol (77 mg, 0.46 mmol) was added. After another 4 hours water was added and the organic layer was separated. The aqueous layer was extracted twice with dichloromethane. The combined organic layers were dried under vacuum. The crude mixture was purified by C-18 reversed phase preparative-HPLC with a gradient of 10-100% acetonitrile/water to give 1-cyclopropyl-5-trifluoromethyl-1H-pyrazole-4-carboxylic acid (5-hydroxy-adamantan-2-yl)-amide (79 mg, 48%. Mass spectrum: m/z: 370.2 (M+1).

Provenance & Evidence