Methylhydrazine → PF-04981517

Participants

Reaction Steps

To a mixture of (4,6-dichloropyrimidin-5-yl)[1-methyl-5-(4-methylphenyl)-1H-pyrazol-4-yl]methanone (C5) (7.3 g, 21 mmol) and N,N-diisopropylethylamine (13.56 g, 104.9 mmol) in acetonitrile (100 mL) was added 1-[(3S)-pyrrolidin-3-yl]piperidine (4.8 g, 31 mmol), and the resulting reaction mixture was stirred at room temperature for 3 hours. To this solution of {4-chloro-6-[(3S)-3-(piperidin-1-yl)pyrrolidin-1-yl]pyrimidin-5-yl}[1-methyl-5-(4-methylphenyl)-1H-pyrazol-4-yl]methanone (C7) was added drop-wise a solution of methylhydrazine (12.1 g, 262 mol) in acetonitrile (20 mL). After being stirred overnight at room temperature, the reaction mixture was concentrated in vacuo and partitioned between dichloromethane (100 mL) and water (100 mL). The aqueous layer was extracted with dichloromethane (2×100 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated; purification via silica gel chromatography (Gradient: 10% to 50% ethyl acetate in petroleum ether) afforded the product as a white solid. Yield: 8.64 g, 18.9 mmol, 90% yield. LCMS m/z 457.3 (M+1). 1H NMR (400 MHz, CDCl3) δ 1.39-1.49 (br m, 2H), 1.53-1.73 and 2.00-2.25 (br multiplets, presumed 8H), 2.31 (s, 3H), 2.32-2.45 (br m, 2H), 2.56-2.68 (br m, 1H), 2.90-3.16 (v br m, 1H), 3.26-3.78 (br m, 3H), 3.87 (s, 3H), 4.00 (s, 3H), 7.16 (br AB quartet, JAB=8 Hz, ΔνAB=26 Hz, 4H), 7.66 (s, 1H), 8.29 (s, 1H).

Provenance & Evidence