Total syntheses of lindenane-type sesquiterpenoids: (±)-chloranthalactones A, B, F, (±)-9-hydroxy heterogorgiolide, and (±)-shizukanolide E
作者:Guizhou Yue、Li Yang、Changchun Yuan、Biao Du、Bo Liu
DOI:10.1016/j.tet.2012.09.053
日期:2012.11
Chloranthalactones A, B, F, 9-hydroxy heterogorgiolide, and shizukanolide E are a family of natural lindenane-type sesquiterpenoids isolated mainly from chloranthaceae. A general synthetic strategy was accomplished by us for the racemic total syntheses of the five natural products. The key steps included substrate-controlled Matteson epoxidation of ketone and highly diastereoselective intramolecular
TiCl4‐Et3N‐mediated condensation of ketones with methyl pyruvate afforded γ‐alkylidene butenolides via a tandem cross‐aldol addition/dehydroxylation/intramolecular lactonization process in one‐pot. The application of the methodology to the straightforward synthesis of elem‐1,3,7,8‐tetraen‐8,12‐olide, chloranthalactone A, and dehydromenthofurolactone, is demonstrated.
TiCl 4 - Et 3 N介导的酮与丙酮酸甲酯的缩合反应通过一个锅中的串联交叉羟醛加成/脱羟基/分子内内酯化过程提供了γ-亚烷基丁烯内酯。演示了该方法在直接合成elem-1,3,7,8-tetraen-8,12-内酯,氯半乳糖苷A和脱氢薄荷脑内酯中的应用。
Synthesis of rac-Lindenene via a thermally induced cyclopropanation reaction
作者:Thomas W. Fenlon、Michael W. Jones、Robert M. Adlington、Victor Lee
DOI:10.1039/c3ob41716f
日期:——
The first synthesis of the sesquiterpene Lindenene is described. A novel non-catalysed intramolecular cyclopropanation reaction between a diazoketone and an unactivated alkene was utilised to construct the relatively labile ketone precursor with complete stereocontrol. This ketone was transformed in three steps into Lindenene.
Abstract An alternative total synthesis of bolivianine in twelve steps is herein reported on the basis of our previous successful bioinspired total synthesis. The present total synthesis features straightforward transformation from an aldol product to the butenolide of the target molecule, and stereoselective Diels-Alder cycloaddition to construct ring E, as well as the final spontaneous IMHDA process
Bioinspired Total Synthesis of Bolivianine: A Diels– Alder/Intramolecular Hetero-Diels–Alder Cascade Approach
作者:Changchun Yuan、Biao Du、Li Yang、Bo Liu
DOI:10.1021/ja4040335
日期:2013.6.26
We report the first total synthesis of bolivanine in a 14 step pathway involving the synthesis of onoseriolide. Our synthesis features a palladium-catalyzed intramolecular cyclopropanation involving an allylic metal carbene and a Diels-Alder/intramolecular hetero-Diels-Alder cascade, allowing the single-step assembly of a tricyclic system with proper configuration. The synthetic efforts validate our modified biogenetic hypothesis and allow us to confirm the absolute configuration of bolivianine.