Potassium Carbonate → {8-Methyl-3-[1-(4-pyrimidin-4-ylphenyl)cyclopropyl]-5,6,8,9-tetrahydro[1,2,4]triazolo[4,3-d][1,4]thiazepin-8-yl}methanol

Participants

Reaction Conditions

Reaction Steps

A reaction mixture of the compound (555 mg, 1.0 mmol) obtained in Example 16-5), 4-bromopyrimidine hydrochloride (234 mg, 1.5 mmol), tetrakis(triphenylphosphine)palladium(0) (231 mg, 0.2 mmol), potassium carbonate (276 mg, 2 mmol), 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 4 M solution (1 mL) of hydrochloric acid in 1,4-dioxane and methanol (4 mL), and the mixture was stirred at room temperature for 15 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 (67 mg, 17%) as a colorless solid.

Provenance & Evidence