Preparation method of megastigmatrienone
A technology of megadyamarinone and alcohol acetate, applied in the field of spices, can solve the problems such as the difficulty in meeting the requirements of manufacturers, and achieve the effects of low reaction condition requirements, high yield and little physical harm
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[0018] The preparation method of macrostigmatrienone of the present invention comprises the following steps:
[0019] (1) Dissolve α-ionol acetate in an organic solvent to form a solution with a concentration of 15%~35% by mass, then add catalyst cuprous chloride and acid to the solution, and then heat the solution at 25°C~40°C Add the oxidant tert-butyl hydroperoxide dropwise to the above mixture under stirring to synthesize 3-oxo-α-ionol acetate, and the reaction time is 4~8h;
[0020] (2), dissolve the 3-oxo-α-ionol acetate obtained in step (1) in an organic solvent to form a solution with a concentration of 20% to 65% by mass, then add catalyst NaOAc, stir and heat to reflux 3~15h, synthesis of macrostigmatrienone crude product;
[0021] (3) Carrying out rectification under reduced pressure to the crude stigmatrienone obtained in the step (2), the target product obtained by the rectification is the stigmatrienone of the present invention.
[0022] Wherein the acid in the...
Embodiment 1
[0034] Example 1: Dissolve 30g of α-ionol acetate in 70ml of acetone, add 3.14g of CuCl, drop in 0.0062g of sulfuric acid, then add dropwise 34.3g of TBHP with a mass percentage concentration of 70% under stirring at 25°C, react for 4 hours, and wash with water. Sodium thiosulfate was quenched, the organic phase was separated, and then the organic solvent was distilled off to obtain 21.3 g of 3-oxo-α-ionol acetate;
[0035] Dissolve the obtained 3-oxo-α-ionol acetate in 76ml of ethylene glycol, add 1.397g of NaOAc, heat to reflux under stirring for 3h, wash the organic phase with water after cooling to neutral, anhydrous Na 2 SO 4 Drying overnight, filtering, and distilling off the organic solvent to obtain the crude stigmatrienone;
[0036]The crude macrostigmatrienone was subjected to vacuum distillation, and the fraction within the boiling range of 120-148°C was collected under a vacuum degree of -0.1-0.09 MPa to obtain 15.6 g of macrostigmatrienone. The content of macr...
Embodiment 2
[0037] Example 2: Dissolve 30g of α-ionol acetate in 90ml of acetonitrile, add 8.38g of CuCl, drop in 0.0031g of sulfuric acid, add dropwise 68.6g of 70% TBHP with stirring at 25°C, and react for 4 hours. Wash with water, quench with sodium thiosulfate, separate the organic phase, then distill off the organic solvent to get 26g of 3-oxo-α-ionol acetate.
[0038] Dissolve the obtained 3-oxo-α-ionol acetate in 70ml of acetone, add 0.426g of NaOAc, heat to reflux under stirring for 10h, wash the organic phase with water after cooling to neutral, anhydrous Na 2 SO 4 Dry overnight, filter, and distill off the organic solvent to obtain the crude macrostigmatrienone.
[0039] The crude macrostigmatrienone was subjected to vacuum distillation, and the fraction within the boiling range of 120-148°C was collected under a vacuum of -0.1-0.09 MPa to obtain 17 g of macrostigmatrienone. The content of macrostigmatrienone detected by GC-MS was 74%, and the total reaction yield was 52%. ...
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