反应详情

Isopropyl chloroformate (3.99 mL) was added dropwise to a solution of (E)-3-[6-methoxy-5-(4-methyl-1H-imidazol-1-yl)pyridin-2-yl]acrylic acid (5.2 g) and N,N-diisopropylethylamine (7.44 mL) in DMF (52 mL) under ice-cooling, and the reaction solution was stirred for 20 minutes. Aqueous ammonic (5.2 mL) was added to the reaction solution, and the reaction solution was stirred at room temperature for 30 minutes. Similarly, ethyl chloroformate (3.76 mL) was added dropwise to a solution of (E)-3-[6-methoxy-5-(4-methyl-1H-imidazol-1-yl)pyridin-2-yl]acrylic acid (4.8 g) and N,N-diisopropylethylamine (6.87 mL) in DMF (48 mL) under ice-cooling, and the reaction solution was stirred for 10 minutes. Then, aqueous ammonia (5.2 mL) was added to the reaction solution, and the reaction solution was stirred at room temperature for 30 minutes. The reaction solutions were mixed and diluted with water and chloroform, and then the organic layer was separated. The aqueous layer was extracted with chloroform five times. The organic layers were combined, dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (chloroform-2-propanol system) to obtain 3.54 g of the title compound. The property value of the compound is as follows.

1. temperaturecooling
2. additionAqueous ammonic (5.2 mL) was added to the reaction solution
3. stirringthe reaction solution was stirred at room temperature for 30 minutes
4. temperaturecooling
5. stirringthe reaction solution was stirred for 10 minutes
6. stirringthe reaction solution was stirred at room temperature for 30 minutes
7. additionThe reaction solutions were mixed
8. customthe organic layer was separated
9. extractionThe aqueous layer was extracted with chloroform five times
10. dry with materialdried over anhydrous magnesium sulfate
11. concentrationconcentrated under reduced pressure
12. customThe residue was purified by silica gel column chromatography (chloroform-2-propanol system)