Dimethyl Sulfoxide → 2-(3,5-Dichloropyrid-4-yl)-1-(3-cyclopentyloxy-6-fluoro-4-methoxyphenyl)ethanone

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Reaction Steps

A solution of oxalyl chloride (0.05 mL) in dichloromethane (3 mL) is cooled to −60° C. and dimethylsulfoxide (1 mL) added. After stirring at this temperature for 0.25 hours, a solution of 2-(3,5-dichloropyrid-4-yl)-1-(3-cyclopentyloxy-6-fluoro-4-methoxyphenyl)ethanol (0.2 g) in dichloromethane (5 mL) is added dropwise. After stirring at −60° C. for 0.25 hours, triethylamine (0.33 mL) is added dropwise and the solution stirred for 0.25 hour at −60° C. and then at room temperature overnight. The solution is then poured into water (30 mL), extracted with ethyl acetate (3×50 mL) and the combined organic extracts washed with brine (30 mL), dried (magnesium sulfate), and concentrated to give a yellow-brown oil. The oil is subjected to mplc on silica gel, using petroleum ether:ethyl acetate (3:1 v/v) as eluent to give 2-(3,5-dichloropyrid-4-yl)-1-(3-cyclopentyloxy-6-fluoro-4-methoxyphenyl)ethanone (0.14 g). m.p. 115–11 6.5° C. [Elemental analysis:—C, 57.7; H, 4.7; N, 3.5%; calculated:—C, 57.3; H, 4.6; N, 3.5%].

Provenance & Evidence