Citric Acid → HCID 68575249, compound

Participants

Reaction Steps

Triethylamine (1.8 ml, 12.8 mmol) and 1,3-dimethyl-1H-pyrazole-5-carbonyl chloride (0.5 g, 3.2 mmol) is added to a stirred solution of 4-isobutylamino-piperidine-1-carboxylic acid tert-butyl ester (0.82 g, 3.2 mmol), and diethyl ether (30 ml). The reaction is stirred for 5 minutes at room temperature. The reaction is poured into 5% citric acid and extracted with ethyl acetate. The ethyl acetate is washed with sodium bicarbonate and brine and dried over sodium sulfate. The sodium sulfate is filtered off and the crude product is concentrated on a rotary evaporator to yield (1.15 g, 96% crude) of 4-{[(1,3-dimethyl-1H-pyrazol-5-yl)-carbonyl]-isobutyl-amino}-piperidine-1-carboxylic acid tert-butyl ester: mass spectrum (ion spray): m/z=379 (M++1); 1H NMR (CD3OD) (broad peaks due to rotamers) δ=6.29-6.17 (1H, br m), 4.23-4.10 (2H, br m), 3.98-3.90 (1H, br m), 3.78 (3H, br s), 3.25 (2H, d), 2.89-2.57 (2H, br m), 2.25 (3H, s), 2.20-2.04 (1H, br m), 1.86-1.70 (3H, br m), 1.46 (9H, s), 1.00-0.74 (6H, br m).

Provenance & Evidence