Phenyl chloroformate → HCID 66876907, compound

Participants

Reaction Steps

3-(2-(Diphenylmethylene)hydrazinyl)-4-methylpyridine (1.3 g, 4.52 mmol) in 3 mL THF was treated with 4,4-dimethyl-3-oxopentanenitrile (850 mg, 6.79 mmol) and 6N HCl (3.8 mL, 22.6 mmol). Stirred the mixture at 50° C. for 24 hours. Extracted using EtOAc/(sat.)NaHCO3 (3×100 mL (sat.)NaHCO3, 1×100 mL brine). Dried using MgSO4 and then purified by flash chromatography (silica, 5-100% EtOAc/Hexane) to afford 3-tert-butyl-1-(4-methylpyridin-3-yl)-1H-pyrazol-5-amine (844 mg, 3.67 mmol, 81%). 1H NMR (300 MHz, DMSO-d6) δ 8.46 (d, 1H), 8.40 (s, 1H), 7.38 (d, 1H), 5.32 (s, 1H), 5.03 (br s, 2H), 2.08 (s, 3H), 1.20 (s, 9H); LC-MS (ESI) m/z 231 (M+H)+. Example 303A Step 3: 3-tert-Butyl-1-(4-methylpyridin-3-yl)-1H-pyrazol-5-amine (844 mg, 3.66 mmol) was treated with phenyl chloroformate (1.90 mL, 15.0 mmol) according to the procedure in Example 118A to afford phenyl 3-tert-butyl-1-(4-methylpyridin-3-yl)-1H-pyrazol-5-ylcarbamate (1.09 g, 3.11 mmol, 85%). 1H NMR (300 MHz, DMSO-d6) δ 10.09 (br s, 1H), 8.53 (d, 1H), 8.43 (s, 1H), 7.44 (d, 1H), 7.39-7.34 (m, 2H), 7.22 (t, 1H), 6.98 (br s, 2H), 6.35 (s, 1H), 2.09 (s, 1H), 1.27 (s, 9H); LC-MS (ESI) m/z 351 (M+H)+.

Provenance & Evidence