Ammonium Chloride → 2-(5-chloro-4-(1-(4-chloro-2-methylphenyl)-2-methoxyvinyl)-1-methyl-1H-pyrazol-3-yl)pyridine

Participants

Reaction Conditions

Reaction Steps

To a solution of (methoxymethyl)triphenylphosphonium chloride (91 g, 265 mmol) in THF (330 mL) at about −10° C. was added 1.6 M butyllithium in hexanes (161 mL, 258 mmol) dropwise. The mixture was stirred at about −10° C. for about 1 h. A solution of (5-chloro-1-methyl-3-(pyridin-2-yl)-1H-pyrazol-4-yl)(4-chloro-2-methylphenyl)methanone (22.35 g, 64.6 mmol) in THF (220 mL) was added to the mixture in a dropwise manner. The mixture was stirred at about −10° C. for about 16 h then treated with a saturated aqueous NH4Cl solution (1000 mL). The mixture was extracted with EtOAc (2×700 mL). The combined organic layers were washed with brine (500 mL), dried with Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography (SiO2, 0-25% EtOAc/heptanes) to give 2-(5-chloro-4-(1-(4-chloro-2-methylphenyl)-2-methoxyvinyl)-1-methyl-1H-pyrazol-3-yl)pyridine (16.65 g, 69%): LC-MS (Table 1, Method g) Rt=2.56 min, m/z 374/376 (M+H)+; 1H-NMR (CDCl3, Bruker 400 MHz) δ 8.44-8.39 (m, 1H), 7.70-7.58 (m, 2H), 7.21-6.93 (m, 4H), 6.39 (s, 1H), 3.90 (s, 3H), 3.64 (s, 3H), 2.28 (2s, 3H) major; 1H-NMR (CDCl3, Bruker 400 MHz) δ 8.44-8.39 (m, 1H), 7.70-7.58 (m, 2H), 7.21-6.93 (m, 4H), 6.38 (s, 1H), 3.88 (s, 3H), 3.52 (s, 3H), 2.20 (s, 3H) minor.

Provenance & Evidence