D-calcium pantothenate synthesis method
A technology of calcium pantothenate and pantothenic acid, applied in the preparation of carboxylic acid amide optical isomers, organic chemistry, etc., can solve the problems of increased cost, increased production cost, high technical requirements, etc., to solve environmental problems, improve utilization rate, The effect of simple process
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Embodiment 1
[0024] 1) In 135 grams (1.64mol) of 28% methanol solution of sodium methoxide, 74 grams (0.50mol) of diethyl oxalate and 73 grams (1.0mol) of isobutyraldehyde were added with stirring at 10°C, and the reaction was stirred for 2 hours . Then the temperature was raised to 25° C., and 120 grams (0.6 mol) of 20% NaOH solution was added dropwise, and the stirring was continued for 4 to 5 hours after the drop was completed within 15 to 20 minutes. The temperature was raised to 40°C, 134 g (1.65 mol) formaldehyde solution was added dropwise, and the reaction was stirred for 10-12 hours. Then it was cooled to 20°C, 110 mL of concentrated hydrochloric acid was added dropwise, and stirred for another 1.5 hours. Filter to remove NaCl; distill the filtrate to remove methanol, and extract the residue three times with 300ml ethyl acetate. The organic layers were combined and redistilled, and the 100-110°C / 5-10Torr fraction was collected to obtain 62.5 grams of crude product, which was was...
Embodiment 2
[0040] The specific steps are the same as in Example 1, except that 5 grams of guanidine pantoate obtained in step 4) of Example 1 are added to 13ml of 0.5g / ml sodium methylate solution, refluxed for 3 hours, and cooled to below 20°C , then add 60mL of water, with 6M H 2 SO 4 After adjusting the pH to 7.0, add 1 mL concentrated H 2 SO 4 . After completion, it was heated to 65° C. for 1 hour to react. Concentrate under reduced pressure to remove methanol. Then extract twice with 1,2-dichloroethane. The organic layers were combined, and the solvent was removed under reduced pressure to obtain 3.3 g of DL-pantolactone, which was used for further resolution to make full use of the pantolactone.
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