Sulfuric Acid → CID 521661

関与物質

反応手順

In 1994 (Choo, Ooi, & Ooi, 1994), synthesis of Civetone was reported from Palm oil. In this process Oleic acid (C18:1) was obtained from Palm oil by hydrolytic splitting with 99% purity. See FIG. 2. The pure Oleic acid was esterified under acidic conditions using concentrated sulfuric acid at 110° C. Self-metathesis of ethyl oleate was performed using WCl6 and SnMe4 to give two products, 9-Octadecene and Diethyl 9-Octadecenedioate, with almost quantitative yields of 97 and 99% respectively. Silica-gel chromatography was used to separate the two products. The Diethyl 9-Octadecenedioate was cyclized using base catalyzed Dieckmann Condensation under inert conditions. Dieckmann Condensation was carried out under argon using potassium hydride (KH) in dry THF at 55° C. for 3 hours to give 2-ethoxycarbonyl-9-cycloheptadecenone with 63% yield which was purified by silica-gel chromatography. Civetone was synthesized by hydrolysis followed by decarboxylation of 2-ethoxycarbonyl-9-cycloheptadecenone using 5% NaOH/THF/Ethanol with 93% yield which was also purified by silica-gel chromatography.

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