Enantioselective Total Synthesis of (+)-Testudinariol A Using a New Nickel-Catalyzed Allenyl Aldehyde Cyclization
作者:Kande K. D. Amarasinghe、John Montgomery
DOI:10.1021/ja027148y
日期:2002.8.1
An enantioselective totalsynthesis of (+)-testudinariol A was completed. A new nickel-catalyzed allenyl aldehyde cyclization was developed in the approach. In addition, an asymmetric anti aldol reaction and a two-directional oxocarbenium ion/vinyl silane condensation were employed as key steps.
(+)-testudinariol A 的对映选择性全合成完成。该方法开发了一种新的镍催化烯醛环化反应。此外,不对称反羟醛反应和双向氧碳鎓离子/乙烯基硅烷缩合被用作关键步骤。
Palladium(0)-Catalyzed Coupling Cyclization of Functionalized Allenes with Hypervalent Iodonium Salts
作者:Suk-Ku Kang、Tae-Gon Baik、Alexander N. Kulak
DOI:10.1055/s-1999-2613
日期:1999.3
The palladium(0)-catalyzed coupling reaction of allenic alcohols, amines, acids with hypervalent iodonium salts afforded the cyclized heterocyclic tetrahydrofurans, tetrahydropyrans, pyrrolidines, piperidines, or lactones under mild conditions.
Access to Functionalized <i>E</i>-Allylsilanes and <i>E</i>-Alkenylsilanes through Visible-Light-Driven Radical Hydrosilylation of Mono- and Disubstituted Allenes
作者:Yanyao Cai、Wenxuan Zhao、Shaozhong Wang、Yong Liang、Zhu-Jun Yao
DOI:10.1021/acs.orglett.9b03679
日期:2019.12.20
visible-light-driven radical hydrosilylation of allene has been achieved by using eosin Y as the photocatalyst, with thiol and base as additives. Depending on allenes, two types of adducts with E-selectivity were obtained. It was demonstrated that monosubstituted nonarylated allenes reacted to give linear E-allylsilanes, while 1,3-disubstituted electron-deficient allenes afforded E-alkenylsilanes. A radical mechanism
Allene epoxidation: synthesis of functionalized lactones by the DMDO oxidation of allenic acids
作者:Jack K Crandall、Elisa Rambo
DOI:10.1016/s0040-4020(02)00698-1
日期:2002.8
products are formed directly from allene oxides, keto lactones are formed. The corresponding spirodioxide intermediates give lactones with appropriately situated α-hydroxyketone moieties. An understanding of the regiochemistry of the epoxidations and the subsequent cyclizations of the reactiveintermediates is developed, as are methods for the manipulation of the experimental conditions to favor the
Ruthenium-Catalyzed Alkylative Lactonization and Carbocyclization
作者:Barry M. Trost、Andrew McClory
DOI:10.1021/ol0610136
日期:2006.8.1
[reaction: see text] The cationic ruthenium complex [CpRu(NCCH3)3]PF6 promotes the coupling of monosubstituted allene carboxylic acids and simple alpha,beta-unsaturated olefins to form five- and six-membered lactones. The mild reaction conditions allow for the presence of various functional groups.