反应详情

A solution of (Z)-6-(2-ethoxyvinyl)-8-phenyl-[1,2,4]triazolo[4,3-a]pyridine (13 mg, 0.049 mmol) in 1,4-dioxane (1 mL) and water (1 mL) was added NBS (9.4 mg, 0.054 mmol) and stirred at rt for 1 h. The mixture was then added 1-propylthiourea (6.4 mg, 0.054 mmol), heated to 85-90° C. for 10 h, then cooled and concentrated. The residue was dissolved in a mixture of 20% MeOH in dichloromethane and purified by 500 μm silica gel prep plate using 75% ethyl acetate in hexanes as an eluent. The product was collected (4.5 mg, 27.4% yield). LCMS: 336.55 (M+H), Tr 2.98 min, (Conditions A).

1. temperaturecooled
2. concentrationconcentrated
3. dissolutionThe residue was dissolved in a mixture of 20% MeOH in dichloromethane
4. custompurified by 500 μm silica gel prep plate
5. customThe product was collected (4.5 mg, 27.4% yield)
6. custom336.55 (M+H), Tr 2.98 min