A concise total synthesis of biologically active frutinones via tributylphosphine-catalyzed tandem acyl transfer-cyclization
摘要:
A concise and step-economical total synthesis of biologically active frutinones has been achieved. Tributylphosphine (PBu3) efficiently induced the tandem acyl transfer-cyclization of carbonates 5 to afford 3-methoxycarbonylflavone derivatives 4 in excellent yields. Finally, concomitant deprotection and lactonization under acidic conditions furnished the desired frutinones A (1a), B (1b), and the proposed structure of frutinone C (1c). (C) 2014 Elsevier Ltd. All rights reserved.
Construction of trisubstituted chromone skeletons carrying electron-withdrawing groups via PhIO-mediated dehydrogenation and its application to the synthesis of frutinone A
作者:Qiao Li、Chen Zhuang、Donghua Wang、Wei Zhang、Rongxuan Jia、Fengxia Sun、Yilin Zhang、Yunfei Du
DOI:10.3762/bjoc.15.291
日期:——
The construction of the biologically interesting chromone skeleton was realized by PhIO-mediated dehydrogenation of chromanones under mild conditions. Interestingly, this method also found application in the synthesis of the naturally occurring frutinone A.
A new protocol for total synthesis of natural product frutinone A was accomplished in three steps by using inexpensive 2′-hydroxyacetophenone as starting material. The key intermediate 3-(2-chlorobenzoyl)-4-hydroxycoumarin was synthesized in one pot through Baker–Venkataraman rearrangement of 2-acetylphenyl 2-chlorobenzoate followed by introduction of methyl chloroformate under basic conditions. Then
Efficient Synthesis of Frutinone A and Its Derivatives through Palladium-Catalyzed CH Activation/Carbonylation
作者:Yongje Shin、Changho Yoo、Youngtaek Moon、Yunho Lee、Sungwoo Hong
DOI:10.1002/asia.201402876
日期:2015.4
Frutinone A, a biologically active ingredient of an antimicrobial herbal extract, demonstrates potent inhibitory activity towards the CYP1A2 enzyme. A three‐step total synthesis of frutinone A with an overall yield of 44 % is presented. The construction of the chromone‐annelated coumarin core was achieved through palladium‐catalyzed CHcarbonylation of 2‐phenolchromones. The straightforward synthetic
本发明公开了一种Frutinone类化合物的合成方法,包括如下步骤:(1)在Cs 2 CO 3 和碱的作用下,取代苯甲酰乙酸乙酯和取代2‑氯苯甲酰氯反应得到中间体1;(2)所述中间体1和三卤化硼进行水解反应,得到中间体2;(3)所述中间体2与过硫酸钾进行氧化反应,得到目标产物。本发明提供的合成方法,以取代苯甲酰乙酸乙酯、取代2‑氯苯甲酰氯、Cs 2 CO 3 、三卤化硼和过硫酸钾等为主要原料,原料价廉、易得,避免了现有方法中所涉及的昂贵的原材料或贵金属催化剂;且该合成方法操作简单,反应条件温和,对环境友好、溶剂易回收套用,适合应用于工业生产。