反应详情

To a mixture of N-(2-hydroxy-5-trifluoromethylphenyl)-2-methylsulfanylbenzamide (0.33 g), triphenylphosphine (0.34 g), and THF (7 ml), diethyl azodicarboxylate (40% in toluene) (0.57 g) was added dropwise, and stirred at room temperature for 1.5 hours. Triphenylphosphine (79 mg) and diethyl azodicarboxylate (40% in toluene, 0.13 g) were added to the mixture, and stirred for further 1 hour. The mixture was heated to 50° C., and stirred for 1.5 hours. The reaction mixture was cooled to room temperature, and then the mixture was allowed to stand at room temperature overnight. The reaction mixture was subjected to silica gel column chromatography to give 0.28 g of 2-(2-methylsulfanylphenyl)-5-trifluoromethylbenzoxazole (hereinafter referred to as Present Compound 77).

1. additionwas added dropwise
2. stirringstirred for further 1 hour
3. temperatureThe mixture was heated to 50° C.
4. stirringstirred for 1.5 hours
5. temperatureThe reaction mixture was cooled to room temperature
6. waitto stand at room temperature overnight