反应详情

To a mixture of tert-butyl (8aS)-8a-(3-aminophenyl)-4,4a,5,7,8,8a-hexahydropyrano[4,3-d][1,3]thiazin-2-ylcarbamate (0.15 g, 0.413 mmol), 5-chloropyridine-2-carboxylic acid (0.078 g, 0.495 mmol) and 1-hydroxybenzotriazole (0.073 g, 0.536 mmol) in CH2Cl2 (2.75 mL) and DMF (0.3 mL) is added 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.103 g, 0.536 mmol). The reaction is stirred overnight at room temperature. The reaction mixture is diluted with water, 5 N NaOH (0.5 mL) and extracted three times with CH2Cl2. The combined organic layer is dried over Na2SO4 and the crude product is purified by silica gel chromatography eluting with a linear gradient of 5% to 100% EtOAc in hexanes to give the title compound (0.176 g, 85%). ES/MS m/e: (35Cl/37Cl) 503, 505 (M+1).

1. extractionextracted three times with CH2Cl2
2. dry with materialThe combined organic layer is dried over Na2SO4
3. customthe crude product is purified by silica gel chromatography
4. washeluting with a linear gradient of 5% to 100% EtOAc in hexanes