Ammonium Chloride → HCID 86688546, compound

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Reaction Steps

The compound (300 mg, 699 μmol) obtained in Example 1 and 3,5-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolane-2-yl)isoxazole (458 mg, 2.10 mmol) were dissolved in a mixture of dimethoxyethane (10 mL) and water (1 mL), under a nitrogen atmosphere, sodium tert-butoxide (470 mg, 4.9 mmol) and tetrakis(triphenylphosphine)palladium(0) (323 mg, 280 μmol) were added thereto, followed by stirring for 16 hours while heating under reflux. A saturated ammonium chloride aqueous solution was added to the resulting mixture to stop the reaction, and after extraction with ethyl acetate, the extract was washed with a saturated sodium chloride aqueous solution and dried over anhydrous sodium sulfate. The desiccant was filtered off, and the residue obtained by evaporation under reduced pressure was purified using medium pressure flash column chromatography (silica gel; methanol:chloroform=1:100), thereby giving the title compound (275 mg, 88%) as an amorphous solid.

Provenance & Evidence