A Very Efficient Route toward the 4a-Methyltetrahydrofluorene Skeleton: Short Synthesis of (±)-Dichroanone and (±)-Taiwaniaquinone H
作者:Enrique Alvarez-Manzaneda、Rachid Chahboun、Eduardo Cabrera、Esteban Alvarez、Ramón Alvarez-Manzaneda、Ricardo Meneses、Hakima Es-Samti、Antonio Fernández
DOI:10.1021/jo900153y
日期:2009.5.1
A very expedient and efficient new route toward taiwaniaquinoids, bearing the 4a-methyltetrahydrofluorene skeleton, is reported. Key steps are the intramolecular Friedel−Crafts alkylation of an aryldiene and the degradative oxidation of a methylenedioxy group; the latter process could also be utilized for building the 2-hydroxy-1,4-benzoquinone unit, which is frequently found in natural products. Utilizing
据报道,一条带有4a-甲基四氢芴骨架的,非常有效和有效的新途径通往台湾喹啉类化合物。关键步骤是芳基二烯的分子内Friedel-Crafts烷基化和亚甲基二氧基的降解氧化。后一种方法也可用于构建天然产物中常见的2-羟基-1,4-苯醌单元。利用这种新方法,已经从商业α-(11a)合成了(±)-二氢呋喃酮(7)(三步,总收率77%)和(±)-taiwaniaquinone H(6)(四步,总收率70%)。)或β-cyclocitral(11b)。