L-羟基环己烷乙酸乙酯

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 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 0.98 g (10 mmol) of cyclohexanone 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 1.76 g of the desired product (yield 95%). The mixture was stirred at 20˜25° C. for 3 hours 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

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a mixture of ethyl(1-hydroxycyclohexyl)acetate (17.1 g, 92.1 mmol) and benzonitrile (9.5 ml, 92.1 mmol) was added conc. sulfuric acid (50 ml) at 0° C., and the mixture was stirred at room temperature for 12 hrs. Water (200 ml) was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, and then with saturated brine and dried over anhydrous MgSO4. After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue, and the mixture was heated under reflux for 6 hrs. Water (400 ml) was added to the reaction mixture, and the mixture was washed with diethyl ether. The aqueous layer was acidified (pH 2) with 5N hydrochloric acid, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous Na2SO4, and concentrated under reduced pressure. The obtained solid was recrystallized from ethanol-toluene to give the title compound (18.1 g, 75%) as colorless crystals. the mixture was extracted with ethyl acetate The extract was washed with saturated aqueous sodium hydrogen carbonate solution with saturated brine and dried over anhydrous MgSO4 After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue the mixture was heated under reflux for 6 hrs Water (400 ml) was added to the reaction mixture the mixture was washed with diethyl ether the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried over anhydrous Na2SO4 concentrated under reduced pressure The obtained solid was recrystallized from ethanol-toluene

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a mixture of ethyl(1-hydroxycyclohexyl)acetate (17.1 g, 92.1 mmol) and benzonitrile (9.5 ml, 92.1 mmol) was added conc. sulfuric acid (50 ml) at 0° C., and the mixture was stirred at room temperature for 12 hrs. Water (200 ml) was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, and then with saturated brine and dried over anhydrous MgSO4. After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue, and the mixture was heated under reflux for 6 hrs. Water (400 ml) was added to the reaction mixture, and the mixture was washed with diethyl ether. The aqueous layer was acidified (pH 2) with 5N hydrochloric acid, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous Na2SO4, and concentrated under reduced pressure. The obtained solid was recrystallized from ethanol-toluene to give the title compound (18.1 g, 75%) as colorless crystals. the mixture was extracted with ethyl acetate The extract was washed with saturated aqueous sodium hydrogen carbonate solution with saturated brine and dried over anhydrous MgSO4 After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue the mixture was heated under reflux for 6 hrs Water (400 ml) was added to the reaction mixture the mixture was washed with diethyl ether the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried over anhydrous Na2SO4 concentrated under reduced pressure The obtained solid was recrystallized from ethanol-toluene

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of cyclohexanone (9.52 g, 97.0 mmol), a zinc powder (7.6 g, 116.4 mmol) and a small amount of iodine in THF (100 ml) was added dropwise ethyl bromoacetate (11.8 ml, 106.7 mmol) under a nitrogen atmosphere, and the mixture was heated under reflux for 5 hrs. 10% Sulfuric acid (100 ml) was carefully added under ice-cooling, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, dried over anhydrous MgSO4, and concentrated under reduced pressure to give the title compound (17.2 g, 94%) as a colorless oil. the mixture was heated under reflux for 5 hrs cooling the mixture was extracted with ethyl acetate The extract was washed with saturated aqueous sodium hydrogen carbonate solution dried over anhydrous MgSO4 concentrated under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a mixture of ethyl (1-hydroxycyclohexyl)acetate (17.1 g, 92.1 mmol) and benzonitrile (9.5 ml, 92.1 mmol) was added conc. sulfuric acid (50 ml) at 0° C., and the mixture was stirred at room temperature for 12 hrs. Water (200 ml) was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, and then with saturated brine and dried over anhydrous MgSO4. After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue, and the mixture was heated under reflux for 6 hrs. Water (400 ml) was added to the reaction mixture, and the mixture was washed with diethyl ether. The aqueous layer was acidified (pH 2) with 5N hydrochloric acid, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous Na2SO4, and concentrated under reduced pressure. The obtained solid was recrystallized from ethanol-toluene to give the title compound (18.1 g, 75%) as colorless crystals. the mixture was extracted with ethyl acetate The extract was washed with saturated aqueous sodium hydrogen carbonate solution with saturated brine and dried over anhydrous MgSO4 After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue the mixture was heated under reflux for 6 hrs Water (400 ml) was added to the reaction mixture the mixture was washed with diethyl ether the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried over anhydrous Na2SO4 concentrated under reduced pressure The obtained solid was recrystallized from ethanol-toluene

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a mixture of ethyl (1-hydroxycyclohexyl)acetate (17.1 g, 92.1 mmol) and benzonitrile (9.5 ml, 92.1 mmol) was added conc. sulfuric acid (50 ml) at 0° C., and the mixture was stirred at room temperature for 12 hrs. Water (200 ml) was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, and then with saturated brine and dried over anhydrous MgSO4. After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue, and the mixture was heated under reflux for 6 hrs. Water (400 ml) was added to the reaction mixture, and the mixture was washed with diethyl ether. The aqueous layer was acidified (pH 2) with 5N hydrochloric acid, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous Na2SO4, and concentrated under reduced pressure. The obtained solid was recrystallized from ethanol-toluene to give the title compound (18.1 g, 75%) as colorless crystals. the mixture was extracted with ethyl acetate The extract was washed with saturated aqueous sodium hydrogen carbonate solution with saturated brine and dried over anhydrous MgSO4 After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue the mixture was heated under reflux for 6 hrs Water (400 ml) was added to the reaction mixture the mixture was washed with diethyl ether the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried over anhydrous Na2SO4 concentrated under reduced pressure The obtained solid was recrystallized from ethanol-toluene

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of cyclohexanone (9.52 g, 97.0 mmol), a zinc powder (7.6 g, 116.4 mmol) and a small amount of iodine in THF (100 ml) was added dropwise ethyl bromoacetate (11.8 ml, 106.7 mmol) under a nitrogen atmosphere, and the mixture was heated under reflux for 5 hrs. 10% Sulfuric acid (100 ml) was carefully added under ice-cooling, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, dried over anhydrous MgSO4, and concentrated under reduced pressure to give the title compound (17.2 g, 94%) as a colorless oil. the mixture was heated under reflux for 5 hrs cooling the mixture was extracted with ethyl acetate The extract was washed with saturated aqueous sodium hydrogen carbonate solution dried over anhydrous MgSO4 concentrated under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a mixture of ethyl (1-hydroxycyclohexyl)acetate (17.1 g, 92.1 mmol) and benzonitrile (9.5 ml, 92.1 mmol) was added conc. sulfuric acid (50 ml) at 0° C., and the mixture was stirred at room temperature for 12 hrs. Water (200 ml) was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, and then with saturated brine and dried over anhydrous MgSO4. After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue, and the mixture was heated under reflux for 6 hrs. Water (400 ml) was added to the reaction mixture, and the mixture was washed with diethyl ether. The aqueous layer was acidified (pH 2) with 5N hydrochloric acid, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous Na2SO4, and concentrated under reduced pressure. The obtained solid was recrystallized from ethanol-toluene to give the title compound (18.1 g, 75%) as colorless crystals. the mixture was extracted with ethyl acetate The extract was washed with saturated aqueous sodium hydrogen carbonate solution with saturated brine and dried over anhydrous MgSO4 After concentration under reduced pressure, ethanol (50 ml) and 50% aqueous potassium hydroxide solution (10 ml) were added to the residue the mixture was heated under reflux for 6 hrs Water (400 ml) was added to the reaction mixture the mixture was washed with diethyl ether the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried over anhydrous Na2SO4 concentrated under reduced pressure The obtained solid was recrystallized from ethanol-toluene

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of cyclohexanone (9.52 g, 97.0 mmol), a zinc powder (7.6 g, 116.4 mmol) and a small amount of iodine in THF (100 ml) was added dropwise ethyl bromoacetate (11.8 ml, 106.7 mmol) under a nitrogen atmosphere, and the mixture was heated under reflux for 5 hrs. 10% Sulfuric acid (100 ml) was carefully added under ice-cooling, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, dried over anhydrous MgSO4, and concentrated under reduced pressure to give the title compound (17.2 g, 94%) as a colorless oil. the mixture was heated under reflux for 5 hrs cooling the mixture was extracted with ethyl acetate The extract was washed with saturated aqueous sodium hydrogen carbonate solution dried over anhydrous MgSO4 concentrated under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of cyclohexanone (9.52 g, 97.0 mmol), a zinc powder (7.6 g, 116.4 mmol) and a small amount of iodine in THF (100 ml) was added dropwise ethyl bromoacetate (11.8 ml, 106.7 mmol) under a nitrogen atmosphere, and the mixture was heated under reflux for 5 hrs. 10% Sulfuric acid (100 ml) was carefully added under ice-cooling, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, dried over anhydrous MgSO4, and concentrated under reduced pressure to give the title compound (17.2 g, 94%) as a colorless oil. the mixture was heated under reflux for 5 hrs cooling the mixture was extracted with ethyl acetate The extract was washed with saturated aqueous sodium hydrogen carbonate solution dried over anhydrous MgSO4 concentrated under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 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 0.98 g (10 mmol) of cyclohexanone 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 1.76 g of the desired product (yield 95%). The mixture was stirred at 20˜25° C. for 3 hours 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