Short and Stereoselective Total Synthesis of Δ-11,13-Didehydroguaianes and -guaianolides: Synthesis of (±)-Achalensolide and (±)-Pechueloic Acid; Revision of the Structure of (+)-Rupestonic Acid
作者:Thomas Sainte-Luce Banchelin、Sébastien Carret、Audrey Giannini、Jean-Pierre Deprés
DOI:10.1002/ejoc.200900456
日期:2009.8
(±)-Pechueloic acid (1), (±)-rupestonic acid (3), and (±)-achalensolide (5) (guaian-8–12-olide class) were prepared stereoselectively in only nine steps from the commercially available tropylium cation via central intermediate 6, which is used as a general and efficient precursor to bicyclo[5.3.0]decane sesquiterpenes. The method does not require function protection. It is highly regio- and stereoselective
(±)-Pechueloic acid (1), (±)-rupesonic acid (3), and (±)-achalensolide (5) (guaian-8–12-olide class) 仅通过 9 个步骤从市售产品中立体选择性地制备tropylium 阳离子通过中心中间体 6,用作双环 [5.3.0] 癸烷倍半萜的通用且有效的前体。该方法不需要功能保护。由于有效的 C-1 差向异构化、选择性 C-8,9 氢化和丙烯酸酯等效物的立体控制的 1,6 共轭加成,它具有高度的区域和立体选择性。这些 Δ-11,13-二脱氢愈创木酚和-愈创木酚内酯是良好的迈克尔受体,因此具有生物活性。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)