Benzyl Chloride → 2-(3-Chlorophenyl)-4-(benzyloxy)-5-[4-(methylsulfonyl)phenyl]-3(2H)-pyridazinone

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Reaction Conditions

Reaction Steps

To a stirred solution of 2-(3-chlorophenyl)-4-hydroxy-5-[4-(methylsulfonyl)phenyl]-3(2H)-pyridazinone (Example 332) (0.100 g, 0.28 mmol) in DMF (2.8 mL) was added benzyl chloride (0.32 mL, 0.28 mmol). The resulting solution was stirred with heating to 60° C. overnight. The solvent was removed in vacuo and the resulting residue partitioned between ethyl acetate and 10% citric acid. After extracting with ethyl acetate, the combined organics were dried over MgSO4 and concentrated in vacuo. The crude product was purified using flash chromatography (SiO2, 1:1 ethyl acetate:hexanes) to provide the desired product (yield: 0.096 g, 76%). mp 110-113° C. 1H NMR (300 MHz, DMSO d6) δ 3.39 (s, 3H), 5.48 (s, 2H), 7.29 (m, 4H), 7.59-7.71 (m, 3H), 7.76 (m, 3H), 8.00 (m, 2H), 8.21 (s, 1H). MS (DCI/NH3) m/z 467 (M+H)+, 484 (M+NH4)+. Anal. calc. for C24H19ClN2O4S: C, 61.73; H, 4.10; N, 6.00. Found: C, 62.00; H, 4.18; N, 5.93.

Provenance & Evidence