反应详情

Under argon atmosphere, 8.3 mL (4.43 mmol, 1.5 equivalent) of the solution of ethyl bromozincacetate in 2-methyltetrahydrofuran obtained in Example 67 was added dropwise to a solution of 1 g (2.96 mmol) of 1-trityl-1H-imidazol-4-carbaldehyde in 10 mL of THF at 5˜8° C. The mixture was stirred at 3˜6° C. for 2 hours and 20 minutes. The mixture was stirred at 20˜25° C. for 1 hour and 15 minutes. 10 mL of 1N hydrochloric acid was added dropwise at 20° C. or lower, followed by dilution with 15 mL of ethyl acetate. Then, the layers were separated. The organic layer was washed successively with 5 mL (×2) of 1N hydrochloric acid, 5 mL of water, 5 mL (×2) of an aqueous saturated sodium bicarbonate solution, and 5 mL (×2) of an aqueous saturated sodium chloride solution. After washing, the organic layer was dried with anhydrous magnesium sulfate. After concentration under reduced pressure, recrystallization with 5 mL of IPE afforded 1.04 g of the desired product (yield 83%).

1. stirringThe mixture was stirred at 20˜25° C. for 1 hour and 15 minutes
2. customThen, the layers were separated
3. washThe organic layer was washed successively with 5 mL (×2) of 1N hydrochloric acid, 5 mL of water, 5 mL (×2) of an aqueous saturated sodium bicarbonate solution, and 5 mL (×2) of an aqueous saturated sodium chloride solution
4. washAfter washing
5. dry with materialthe organic layer was dried with anhydrous magnesium sulfate
6. concentrationAfter concentration
7. customunder reduced pressure, recrystallization with 5 mL of IPE