Potassium Carbonate → 3-(4-{1-[8-(Hydroxymethyl)-8-methyl-5,6,8,9-tetrahydro[1,2,4]triazolo[4,3-d][1,4]thiazepin-3-yl]cyclopropyl}phenyl)isonicotinonitrile

Participants

Reaction Steps

A solution of the compound (508 mg, 1.0 mmol) obtained in Example 16-4), 4-cyanopyridine-3-boronic acid pinacol ester (366 mg, 1.5 mmol), tetrakis(triphenylphosphine)palladium(0) (231 mg, 0.2 mmol), and potassium carbonate (276 mg, 2 mmol) in dimethoxyethane (4 mL) and water (1 mL) was stirred at 130° C. for 1.5 h under microwave irradiation. The reaction mixture was cooled to room temperature, saturated aqueous sodium hydrogencarbonate was added to the reaction mixture, the mixture was extracted with dichloromethane, and the organic layer was washed with saturated sodium chloride solution and dried with anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure, and the residue was partially purified by silica gel chromatography (Isco Combiflash, 40 g, methanol:ethyl acetate=0:100 to 20:80, gradient). This partially purified product was dissolved in a solution of 4 M hydrochloric acid (1,4-dioxane solution, 1 mL) in methanol (4 mL), and the mixture was stirred at room temperature for 16 h. The reaction mixture was concentrated under reduced pressure, saturated aqueous sodium hydrogencarbonate was added to the residue, the mixture was extracted with dichloromethane, and the organic layer was washed with saturated sodium chloride solution and dried with anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure, and the residue was purified by silica gel chromatography (Isco Combiflash, 12 g, methanol:ethyl acetate=0:100 to 40:60, gradient) to obtain the title compound (109 mg, 26%) as a colorless solid.

Provenance & Evidence