Method for synthesizing cis-and trans-menthone-8-thioacetate
A synthetic method and technology of menthone, which is applied in the field of synthesis of cis and trans-menthone-8-thiol acetate, can solve the problems of high price and low conversion rate, and achieve simple operation, mild reaction and few isomers Effect
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Embodiment 1
[0013] A kind of synthetic method of cis and trans-menthone-8-thiol acetate, carries out following steps successively:
[0014] 1), Acetylation: Add 120-240g acetic anhydride, 0.04-0.4g anhydrous sodium acetate, 40g thiomenthone into a 250ml three-necked flask, heat up to 100-120°C, and distill out the generated Acetic acid until the 8-thiomenthone content in the reaction system is less than 1% according to GC analysis, under vacuum conditions, the excess acetic anhydride after the reaction is distilled out, and the reaction time is 30 hours.
[0015] 2) Neutralization and washing: add the remaining liquid in the reaction bottle to a 500ml separating funnel, then add 300ml of 10% sodium carbonate aqueous solution to shake fully, let it stand, separate the alkaline water, and wash it once with clean water to obtain 49.6g of crude material.
[0016] 3) Distillation: Add 0.25g of sodium chloride to the crude material during distillation, and gradually increase the internal temper...
Embodiment 2
[0018] A kind of synthetic method of cis and trans-menthone-8-thiol acetate, carries out following steps successively:
[0019] 1) Acetylation: Add 300-600g of acetic anhydride, 0.1-1.0g of anhydrous sodium acetate, and 100g of thiomenthone into a 1000ml three-necked flask, heat up to 100-120°C, and distill out the generated during the reaction under vacuum conditions Acetic acid, until the 8-thiomenthone content in the reaction system is less than 1% according to GC analysis, under vacuum conditions, the excess acetic anhydride after the reaction is distilled out, and the reaction time is 35 hours.
[0020] 2) Neutralization and washing: Add the remaining liquid in the reaction bottle to a 1000ml separating funnel, then add 750ml of 10% sodium carbonate aqueous solution to shake fully, let it stand, separate the alkaline water, and wash it once with clean water to obtain 125.3g of crude material.
[0021] 3) Distillation: Add 0.625g of sodium chloride to the crude material du...
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