1-Hydroxybenzotriazole → HCID 44235032, compound

Participants

Reaction Steps

DIPEA (200 mg, 1.5 mmol) was added to a stirred solution of 5-(5-chloro-thiophen-2-yl)-1H-pyrazole-3-carboxylic acid (100 mg, 0.44 mmol) (prepared by the method used for the synthesis of Intermediate 29, starting from 2-acetyl-5-chlorothiophene) in DMF (2 mL) followed by HOBt (63 mg, 0.46 mmol) and EDCI.HCl (90 mg, 0.46 mmol). After 5 minutes 2-amino-1-[4-(3-trifluoromethyl-phenoxy)-piperidin-1-yl]-ethanone hydrochloride (140 mg, 0.44 mmol) (prepared according to Step 1 and 5 of the General Scheme) was added to the reaction mixture and stirring was continued at ambient temperature overnight. The reaction mixture was diluted with cold water, extracted with ethyl acetate, dried over sodium sulfate and concentrated under reduced pressure. Purification by recrystallisation from 10% EtOAc in hexane afforded 146 mg (65.1% Yield) of 5-(5-chloro-thiophen-2-yl)-1H-pyrazole-3-carboxylic acid {2-oxo-2-[4-(3-trifluoromethyl-phenoxy)-piperidin-1-yl]-ethyl}-amide. LC/MS [M+H]+: 513, 98.3%. 1H NMR (300 MHz, DMSO-d6): δ 13.7 (s, 1H), 8.64 (m, 1H), 7.5 (t, 1H), 7.3 (m, 3H), 7.2 (m, 2H), 6.9 (m, 1H), 4.7 (m, 1H), 4.2 (m, 2H), 3.9 (m, 1H), 3.7 (m, 1H), 3.4 (m, 1H), 3.3 (m, 1H), 1.9 (m, 2H), 1.6 (m, 2H).

Provenance & Evidence