作者:Kikumasa Sato、Seiichi Inoue、Haruhito Sato
DOI:10.1246/bcsj.45.3455
日期:1972.11
2,3-Dimethoxy-5-methylbenzoquinone, the key intermediate of the synthesis of coenzyme Q, was synthesized via two new routes. The methylation of 5-nitrovanillin gave 5-nitroveratraldehyde, which was then catalytically reduced to afford 5-aminohomoveratrol. The oxidation of 5-aminohomoveratrol gave 2,3-dimethoxy-5-methylbenzoquinone. 2,3,4-Trimethoxyphenol was obtained by the decarboxylation of 3,4,5-trimethoxysalicylic acid. This was converted via Mannich reaction to 2,3,4-trimethoxy-6-methylphenol, which was then easily oxidized to 2,3-dimethoxy-5-methylbenzoquinone.
通过两条新路线合成了辅酶Q合成中的关键中间体2,3-二甲氧基-5-甲基苯醌。通过对5-硝基香兰素的甲基化得到5-硝基藜芦醛,然后催化还原得到5-氨基高藜芦醇。对5-氨基高藜芦醇进行氧化得到了2,3-二甲氧基-5-甲基苯醌。通过3,4,5-三甲氧基水杨酸的脱羧反应得到了2,3,4-三甲氧基苯酚。然后通过曼尼希反应转化为2,3,4-三甲氧基-6-甲基苯酚,再通过简单氧化得到2,3-二甲氧基-5-甲基苯醌。