Sodium Hydroxide → Y86EH62Njl

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Reaction Steps

A solution of 4-[4-(4-fluorophenoxy)benzenesulfonylamino]tetrahydropyran-4-carboxylic acid ethyl ester (34.19 grams, 0.807 mole) in ethanol (330 mL) was treated with aqueous 3 M sodium hydroxide solution (330 mL, 0.990 mole) and heated to reflux overnight. The solvent was evaporated under vacuum and the residue partitioned between water and diethyl ether. The aqueous layer was washed with diethyl ether, acidified to pH 1 with 3N aqueous hydrochloric acid solution and extracted with ethyl acetate. After washing with water, the organic extract was dried over sodium soulfate, and concentrated to give 4-[4-(4-fluorophenoxy)benzenesulfonylamino]tetrahydropyran-4-carboxylic acid (31.26 grams, 98%) as a white crystalline solid. 1HNMR (CDCl3) δ 7.73 (d, 2H), 7.03 (t, 2H) 6.96 (m, 2H), 6.91 (d, 2H), 3.56 (m, 2H), 3.43 (br m, 3H), 2.01 (m, 2H), 1.80 (br d, 2H). MS Atmospheric Pressure Chemical Ionization Mass Spectra: 394 (M+ -1) (-ion).

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