p-Toluenesulfonic acid monohydrate → 7-(4,4,4-Trifluoro-3-hydroxy-3-hydroxymethyl-1,1-dimethyl-butyl)-2,3-dihydrobenzofuran-5-sulfonic acid dimethylamide

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Reaction Steps

A mixture of 1.18 g (2.61 mmol) of 7-[2-(2,2-dimethyl-4-trifluoromethyl-[1,3]dioxolan-4-yl)-1,1-dimethyl-ethyl]-2,3-dihydrobenzofuran-5-sulfonic acid dimethylamide and 303 mg (1.59 mmol) of p-toluenesulfonic acid monohydrate in 20 mL of methanol was warmed at reflux for 3 days. The mixture was then cooled and diluted with 15 mL of saturated aqueous sodium bicarbonate and extracted with three 15 mL portions of ethyl acetate. The combined organic layers were washed with two 15 mL portions of saturated aqueous sodium bicarbonate, two 15 mL portions of brine, dried over magnesium sulfate, filtered, and concentrated in vacuo. The residue was triturated with ether to afford 845 mg (78% yield) of the title compound as a white solid.

Provenance & Evidence