Scope and Mechanism of the Pt-Catalyzed Enantioselective Diboration of Monosubstituted Alkenes
作者:John R. Coombs、Fredrik Haeffner、Laura T. Kliman、James P. Morken
DOI:10.1021/ja4041016
日期:2013.7.31
The Pt-catalyzed enantioselective diboration of terminal alkenes can be accomplished in an enantioselective fashion in the presence of chiral phosphonite ligands. Optimal procedures and the substrate scope of this transformation are fully investigated. Reaction progress kinetic analysis and kinetic isotope effects suggest that the stereodefining step in the catalytic cycle is olefin migratory insertion
Self-Assembly of Disorazole C<sub>1</sub>through a One-Pot Alkyne Metathesis Homodimerization Strategy
作者:Kevin J. Ralston、H. Clinton Ramstadius、Richard C. Brewster、Helen S. Niblock、Alison N. Hulme
DOI:10.1002/anie.201501922
日期:2015.6.8
prior examples of an alkyne‐metathesis‐based homodimerization approach to natural products. In this approach to the cytotoxic C2‐symmetric marine‐derived bis(lactone) disorazole C1, a highly convergent, modular strategy is employed featuring cyclization through an ambitious one‐pot alkyne cross‐metathesis/ring‐closing metathesis self‐assembly process.
炔烃复分解作为闭合大环的可靠方法越来越多地被探索,但没有先前的基于炔烃复分解的天然产物同二聚化方法的例子。在这种细胞毒性C 2对称海洋衍生双(内酯)二甲拉唑 C 1的方法中,采用高度收敛的模块化策略,通过雄心勃勃的单锅炔烃交叉复分解/闭环复分解自组装过程进行环化.
Utilization of 1-Oxa-2,2-(dimesityl)silacyclopentane Acetals in the Stereoselective Synthesis of Polyols
作者:Sharon A. Powell、Jason M. Tenenbaum、K. A. Woerpel
DOI:10.1021/ja027335w
日期:2002.10.1
developed a route for the stereoselective synthesis of 1-oxa-2,2-(dimesityl)silacyclopentane acetals, intermediates in the synthesis of highly functionalized 1,3-diols. This route involves a diastereoselective conjugate addition reaction of a hydrosilyl anion, a subsequent diastereoselective enolate alkylation, and a fluoride-catalyzed intramolecular hydrosilylation reaction to afford the oxasilacyclopentane
Total Synthesis of the Putative Structure of Asperipin-2a and Stereochemical Reassignment
作者:Sadegh Shabani、Jonathan M. White、Craig A. Hutton
DOI:10.1021/acs.orglett.0c02884
日期:2020.10.2
The totalsynthesis of the putativestructure of asperipin-2a is described. The synthesis features ether cross-links between the phenolic oxygen of Tyr6 and the β position of Tyr3 and the phenolic oxygen of Tyr3 and the β position of Hpp1 in the unique 17- and 14-membered bicyclic structure of asperipin-2a, respectively. The synthesized putativestructure does not match the natural product, and a stereochemical