Synthesis of Fluorine Analogs of Vitamin E. IV. Synthesis of Bis(trifluoromethyl)tocopherols.
作者:Mayumi KOYAMA、Toshiyuki TAKAGI、Akira ANDO、Itsumaro KUMADAKI
DOI:10.1248/cpb.43.1466
日期:——
We previously synthesized mono(trifluoromethyl)tocopherols, which were used for investigation of the mobility and orientation of tocopherol in Iliposomes by 19F-NMR. For more precise investigation of the behavior of vitamin E in liposomes, tocopherols having two trifluoromethyl groups, one on the prenyl side chain and the other on the chromanol ring, were synthesized. Thusn, dimethylhydroquinones were treated with 6-chloro-3-methyl-2-hexenol in the presence of zinc chloride to give 2-(3-chloropropyl)trimethylchromanol derivatives. These were converted to phosphonium salts, which, upon condensation with trifluoromethylated ketones followed by hydrogenation, gave tocopherols with a trifluoromethyl group on the side chain and a hydrogen on the chromanol part. These were halogenated on the chromanol part and treated with trifluoromethyl iodide and copper powder to give the title compounds.
我们之前合成了单(三氟甲基)生育酚,用于通过 19F-NMR 研究生育酚在脂质体中的迁移率和取向。为了更精确地研究维生素 E 在脂质体中的行为,合成了具有两个三氟甲基的生育酚,一个在异戊烯基侧链上,另一个在苯并二氢吡喃醇环上。因此,在氯化锌存在下用6-氯-3-甲基-2-己烯醇处理二甲基氢醌,得到2-(3-氯丙基)三甲基苯并二氢吡喃醇衍生物。将它们转化为鏻盐,与三氟甲基化酮缩合,然后氢化,得到侧链上有三氟甲基且苯并二氢吡喃醇部分上有氢的生育酚。将它们在苯并二氢吡喃醇部分上卤化,并用三氟甲基碘和铜粉处理,得到标题化合物。