Hydrochloric Acid → HCID 20187113, compound

Under argon atmosphere, 39.7 mL (4.43 mmol, 1.5 equivalents) of the solution of 2-bromozinc-γ-butyrolactone in tetrahydrofuran obtained in Example 61 was added dropwise to a solution of 1.25 mL (10.7 mmol) of acetophenone in 10 mL of THF at 6˜8° C. The mixture was stirred at 4˜6° C. for 4 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 of 1N hydrochloric acid, 10 mL of water, 20 ml, 15 mL and 10 mL 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. After concentration under reduced pressure, purification with silica gel column (developing solvent; ethyl acetate/n-hexane=1/3, 1/2, 1/1) afforded 1.88 g of the desired product (NMR yield 62.5%; internal standard dioxane). 0.92 g of the desired product was obtained as crystals (yield 42%).

1. customThen, the layers were separated
2. washThe organic layer was washed successively with 10 mL of 1N hydrochloric acid, 10 mL of water, 20 ml, 15 mL and 10 mL of an aqueous saturated sodium bicarbonate solution, and 10 mL (×2) of an aqueous saturated sodium chloride solution
3. washAfter washing
4. dry with materialthe organic layer was dried with anhydrous magnesium sulfate
5. concentrationAfter concentration
6. customunder reduced pressure, purification with silica gel column (developing solvent; ethyl acetate/n-hexane=1/3, 1/2, 1/1)

ORD record

ord-2735859b4fd9433fa328b5c922c7262b

Source dataset

uspto-grants-2010_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07662974B2