hongoquercin B ethyl ester;ethyl (3S,4aR,6aR,12aR,12bS)-3,11-dihydroxy-4,4,6a,9,12b-pentamethyl-1,2,3,4a,5,6,12,12a-octahydrobenzo[a]xanthene-10-carboxylate
Cascade Polyketide and Polyene Cyclizations: Biomimetic Total Synthesis of Hongoquercin B
作者:Tim N. Barrett、Anthony G. M. Barrett
DOI:10.1021/ja511534x
日期:2014.12.10
The total synthesis of hongoquercin B was carried out in 9 steps from trans,trans-farnesyl acetate using a palladium catalyzed decarboxylative π-farnesyl rearrangement of a diketo-dioxinone ester, aromatization and cationic diene-epoxide cyclization as key steps. This cascade tetracyclization simplifies the synthesis of terpenoid resorcylate natural products.
使用钯催化的二酮-二恶英酯的脱羧 π-法呢基重排、芳构化和阳离子二烯-环氧化物环化作为关键步骤,从反式,反式-法呢基乙酸酯分 9 个步骤进行红槲皮素 B 的全合成。这种级联四环化简化了萜类再苯二甲酸酯天然产物的合成。