Diisopropylethylamine → 1-[3-(4-Chlorophenyl)-2-(2-chlorophenyl)-6-methylpyrazolo[1,5-a]pyrimidin-7-yl]-4-ethylaminopiperidine-4-carboxylic Acid Amide

Participants

Reaction Conditions

Reaction Steps

To a solution of 7-chloro-3-(4-chlorophenyl)-2-(2-chlorophenyl)-6-methylpyrazolo[1,5-a]pyrimidine (I-3A-1d; 31.3 mg, 0.0806 mmol) and diisopropylethylamine (0.025 ml, 0.14 mmol) in THF (1 ml) was added 4-ethylaminopiperidine-4-carboxylic acid amide (I-1A-1g; 18.5 mg, 0.108 mmol). The mixture was stirred at 50° C. for 20 hours. After cooling to room temperature, the reaction was extracted from saturated aqueous NaHCO3 with ethyl acetate, the combined organic layers were dried (MgSO4), concentrated and purified on a Biotage™ Flash 12S column using 0–5% methanol in methylene chloride as eluant to afford, after trituration from hexanes/methylene chloride, product 3A-1 as a solid (29 mg, 69%): +ESI MS (M+1) 523.4; 1H NMR (400 MHz, CD3OD) δ 8.24 (s, 1H), 7.48–7.34 (m, 6H), 7.21 (d, J=8.7 Hz, 2H), 3.82–3.74 (m, 2H), 3.66–3.58 (m, 2H), 2.51 (q, J=7.1 Hz, 2H), 2.39 (s, 3H), 2.28–2.20 (m, 2H), 1.88–1.80 (m, 2H), 1.10 (t, J=7.1 Hz, 3H).

Provenance & Evidence