Tetrahydrofuran → 2-(3-Tert-butoxycarbonylamino pyridin-4-yl)-5-(trifluoromethyl)benzoxazole

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반응 단계

To a mixture of 1.78 g of 3-tert-butoxycarbonylamino-N-[2-hydroxy-5-(trifluoromethyl)phenyl]isonicotinamide, 20 ml of tetrahydrofuran and 1.29 g of triphenylphosphine, 2.15 g of 40% toluene solution of diethyl azodicarboxylate was added dropwise at room temperature. The reaction mixture was stirred at room temperature for one hour and then stirred while heating at 50° C. for 30 minutes. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 0.69 g of 2-(3-tert-butoxycarbonylamino pyridin-4-yl)-5-(trifluoromethyl)benzoxazole (hereinafter, referred to as “active compound 36”).

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