Hydrochloric Acid → Ethyl 2-(1-hydroxycyclopentyl)acetate

Beteiligte Stoffe

Reaktionsschritte

Under nitrogen atmosphere 30 mL of THF was added to 6.09 g (10 mmol, 1.0 equivalent) of BrZnCH2COOEt.THF)2. Under argon atmosphere, a solution of 0.84 g (10 mmol) of cyclopentanone in 5 mL of THF was added dropwise while stirring at 0˜5° C. The mixture was stirred at 20˜25° C. for 3 hours. 15 mL of 1N hydrochloric acid was added dropwise at 20° C. or lower, followed by dilution with 50 mL of ethyl acetate. Then, the layers were separated. The organic layer was washed successively with 10 mL (×2) of 1N hydrochloric acid, 10 mL of an aqueous saturated sodium chloride solution, 20 mL (×2) of an aqueous saturated sodium bicarbonate solution, and 10 mL (×2) of an aqueous saturated sodium chloride solution. After washing, the organic layer was dried with anhydrous magnesium sulfate. Concentration under reduced pressure afforded 1.73 g of the desired product (yield 94%).

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