2-Chloro-N-methoxy-N,3-dimethylbenzamide → 4-chloro-N-[5-chloro-2-(2-chloro-3-methyl-benzoyl)-pyridin-3-yl]-N-methoxymethyl-3-trifluoromethyl-benzenesulfonamide

Participants

Reaction Conditions

Reaction Steps

To a solution of N-(2-bromo-5-chloro-pyridin-3-yl)-4-chloro-N-methoxymethyl-3-trifluoromethyl-benzenesulfonamide (984 mg, 2.0 mmol) in THF (10 mL) under nitrogen atmosphere at 0° C. was added dropwise isopropylmagnesium chloride (2 M solution in THF, 2.5 mL, 5.0 mmol). The mixture was then stirred for 30 min at 0° C. followed by the addition of 2-chloro-N-methoxy-3,N-dimethyl-benzamide (852 mg, 4.0 mmol) at 0° C. The mixture was stirred at room temperature for 3 h, quenched with saturated aqueous NH4Cl solution (5 mL), and extracted with EtOAc (2×25 mL). The combined organic layers were washed with saturated aqueous NH4Cl solution (25 mL), brine (25 mL), dried (anhydrous Na2SO4) and concentrated under reduced pressure. The residue was column purified (SiO2, 50% EtOAc-hexanes) to obtain 4-chloro-N-[5-chloro-2-(2-chloro-3-methyl-benzoyl)-pyridin-3-yl]-N-methoxymethyl-3-trifluoromethyl-benzenesulfonamide (586 mg) in 52% yield. ESMS m/z (relative intensity): 534.9 [(M-32+H)]+ (70), 588.9 (M+Na)+.

Provenance & Evidence