Method for synthesizing (S)(-)-gamma-lactone
A synthesis method and lactone technology are applied in the field of preparation of chiral synthetic fragrances, can solve problems such as no reports, and achieve the effects of improving economic value and improving aroma quality
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Embodiment 1
[0007] In a 50 ml three-necked flask, 2.4 g (60 mmol) of sodium hydroxide was dissolved in 20 ml of water, and 6.8 g (40 mmol) of racemic gamma-decalactone was added dropwise at 60°C, and Stirring was continued at temperature for 2 hours. After cooling to room temperature, add 20 ml of ethyl acetate, then dropwise add 20% sulfuric acid to adjust the acidity to P H =5. Extract and separate the organic layer, and extract twice with ethyl acetate. The organic layers were combined, and 2.4 g (20 mmol) of (R)-(+)-α-phenethylamine was added. The solution was cooled at -15 to -30°C for 48 hours to obtain 2.5 g of white crystals. Dissolve the crystals in 10 ml of water and heat to 90°C. When all the solids are dissolved, dilute sulfuric acid is added to obtain a hydroxy acid, which is further cyclized into a lactone. Extracted with ethyl acetate, the organic layer was dried with anhydrous magnesium sulfate, (S)-(-)-γ-decalactone was obtained after removing the solvent, the yield w...
example 2
[0009] In a 1000 ml three-necked flask, 38.4 g (960 mmol) of sodium hydroxide was dissolved in 320 ml of water, and 108.8 g (640 mmol) of racemic gamma-decalactone was added dropwise at 60°C, and Stirring was continued at temperature for 2 hours. After cooling to room temperature, add 320 milliliters of ethyl acetate, then dropwise add 20% sulfuric acid to adjust the acidity to P H =5. The organic layer was separated and extracted twice with ethyl acetate. The organic layers were combined, 128 ml of methanol was added, and 38.7 g (320 mmol) of (R)-(+)-α-phenethylamine were added. The solution was cooled at -22°C for 18.5 hours to obtain 65.0 g of white crystals. Dissolve the crystals in 100 ml of water and heat to 90°C. When all the solids are dissolved, dilute sulfuric acid is added to obtain the hydroxy acid, which is further cyclized into a lactone. Extracted with ethyl acetate, the organic layer was dried with anhydrous magnesium sulfate, and (S)-(-)-γ-decalactone was ...
example 3
[0011] In a 1000 ml three-necked flask, 38.4 g (960 mmol) of sodium hydroxide was dissolved in 320 ml of water, and 108.8 g (640 mmol) of racemic gamma-decalactone was added dropwise at 60°C, and Stirring was continued at temperature for 2 hours. After cooling to room temperature, add 320 milliliters of ethyl acetate, then dropwise add 20% sulfuric acid to adjust the acidity to P H =5. The organic layer was separated and extracted twice with ethyl acetate. The organic layers were combined, 128 ml of methanol was added, and 38.7 g (320 mmol) of (R)-(+)-α-phenethylamine were added. The solution was cooled at -22°C for 67.5 hours to obtain 60.0 g of white crystals. The crystals were dissolved in 50 ml of water, heated to 80°C, and when the solid was completely dissolved, cooled to room temperature, and 55.0 g of solid was obtained by suction filtration.
[0012] Dissolve the recrystallized solid in an appropriate amount of water and heat to 90°C. When the solid is completely ...
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