Preparation of 4, 6, 3′,4′-tetrasubstituted aurones<i>via</i>aluminium oxide-catalyzed condensation
作者:David Bolek、Michael Gütschow
DOI:10.1002/jhet.5570420721
日期:2005.11
4,6,3′,4′-Tetrasubstituted aurones were prepared by a protection-deprotection route with an alumina-catalyzed condensation of 3(2)H-benzofuranones with substituted aldehydes as the key step. Aureusidin (6) was obtained by demethylation of 4,6,3′,4′-tetramethoxyaurone (5), a natural product from Cyperus capita-tus. 4,6,3′,4′-Tetrabenzyloxyaurone (9) was converted in a one hydrogenation-deprotection
通过保护-脱保护途径,以3(2)H-苯并呋喃酮与取代的醛的氧化铝催化缩合反应,制备了4,6,3',4'-四取代的金氧烷,这是关键步骤。金黄色素(6)是通过4,6,3',4'-四甲氧基甲隆(5)的甲基化获得的,这是一种天然的香附子。在一个加氢-脱保护步骤中,将4,6,3',4'-四苄氧基金龙酮(9)转化为二氢金葡糖苷(10)。