2-Acetoxy-3-methoxy-5-methyl-p-benzoquinone (IV) was synthesized by two methods starting from vanillin but the yield was not good in either case. The hydroquinone compound of IV was condensed with phytol and the product was hydrolyzed to give 2-hydroxy-3-methoxy-5-methyl-6-phytyl-p-benzoquinone (XI). Treatment of XI with triethylamine afforded the chromenol compound (XII), and difference in color reaction with phosphomolybdic acid of demethylubichromenol (35)(C) derived from demethylubiquinone (B) gave a powerful support to the structure of the latter (B).
以
香兰素为原料,用两种方法合成了 2-乙酰氧基-3-甲氧基-5-甲基
对苯醌(IV),但产量都不高。IV 的
对苯二酚化合物与
植物醇缩合,
水解产物得到 2-羟基-3-甲氧基-5-甲基-6-庚基
对苯醌(XI)。用
三乙胺处理 XI 后,得到
色酚化合物 (XII),而从去甲基
泛醌 (B) 中得到的去甲基次
色酚 (35)(C)与
磷钼酸的颜色反应差异为后者 (B) 的结构提供了有力的支持。