Hydrochloric Acid → HCID 57465824, compound

20.4 mL (20 mmol, 2 equivalents) of the solution of (−)-menthyl bromozincacetate in tetrahydrofuran obtained in Example 63 was added dropwise to a solution of 0.58 mL (5 mmol) of acetophenone in 3 mL of THF at 5˜7° C. The mixture was stirred at 3˜7° C. for 4 hours. 10 mL of 1H hydrochloric acid was added at 20° C. or lower, followed by dilution with 20 mL of ethyl acetate. Then, the layers were separated. The organic layer was washed successively with 5 mL of 1N hydrochloric acid, 5 mL of water, 10 mL and 5 mL 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, purification with silica gel column (developing solvent; ethyl acetate/n-hexane=1/5, 1/3) afforded 1.69 g of the desired product (NMR yield 92%; internal standard dioxane). Recrystallization with n-hexane afforded 0.74 g of the desired product (yield 47%).

1. customThen, the layers were separated
2. washThe organic layer was washed successively with 5 mL of 1N hydrochloric acid, 5 mL of water, 10 mL and 5 mL of an aqueous saturated sodium bicarbonate solution, and 5 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=1/5, 1/3)

ORD record

ord-869f1a251efc4bb693e2a66c39842de9

Source dataset

uspto-grants-2010_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07662974B2