2-Aminoadamantane hydrochloride → 1-cyclopropyl-5-trifluoromethyl-1H-pyrazole-4-carboxylic acid adamantan-2-ylamide

Participants

Reaction Steps

1-Cyclopropyl-5-trifluoromethyl-1H-pyrazole-4-carboxylic acid (Intermediate 6, 20 mg, 0.09 mmol) was dissolved in a mixture of dry dichloromethane (1.6 mL) and dry DMF (0.2 mL). DIPEA (0.1 mL, 0.57 mmol) and TSTU (33 mg, 0.11 mmol) were added to the above mixture. After the mixture was stirred for 1 h, the appearance of active ester was detected by LC-MS. Then 2-aminoadamantane hydrochloride (17 mg, 0.09 mmol) was added. After another 2 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 and purified by silica chromatography eluting with a gradient of 0-40% ethyl acetate/hexanes, then 40% ethyl acetate/hexanes to give 1-cyclopropyl-5-trifluoromethyl-1H-pyrazole-4-carboxylic acid adamantan-2-ylamide (18 mg, 56%). Mass spectrum: m/z: 354.2 (M+1).

Provenance & Evidence