Syntheses of isomerically pure reference octalins and hydrindanes
摘要:
We describe herein the development of efficient and stereoselective synthetic routes to a range of cis- and trans-octalin and hydrindane target compounds. (C) 2009 Elsevier Ltd. All rights reserved.
A Straightforward Route to Functionalized <i>trans</i>-Diels−Alder Motifs
作者:Jun Hee Lee、Yandong Zhang、Samuel J. Danishefsky
DOI:10.1021/ja1073855
日期:2010.10.20
A sequence consisting of a Lewis acid-catalyzed Diels-Alder reaction on a 2-halocyclohexenone, followed by reductive alkylation, provides a route to trans-fused octalinones bearing angularmethyl groups with functionality corresponding to that which would have been possible from a trans-directed Diels-Alder reaction.
Total Synthesis of (−)-Xylogranatopyridine B via a Palladium-Catalyzed Oxidative Stannylation of Enones
作者:Alexander W. Schuppe、David Huang、Yifeng Chen、Timothy R. Newhouse
DOI:10.1021/jacs.7b13189
日期:2018.2.14
We report a total synthesis of the pyridine-containing limonoid alkaloid (-)-xylogranatopyridine B in 11 steps from commercially available dihydrocarvone. The central pyridine ring was assembled by a late-stage fragment coupling approach employing a modified Liebeskind pyridine synthesis. One fragment was prepared by an allyl-palladium catalyzed oxidativeenone β-stannylation, in which the key bimetallic
我们报告了含吡啶的柠檬苦素生物碱 (-)-xylogranatopyridine B 在 11 个步骤中从市售二氢香芹酮的全合成。中央吡啶环通过后期片段偶联方法组装,采用改良的 Liebeskind 吡啶合成。一个片段是通过烯丙基-钯催化的氧化烯酮β-甲锡烷基化制备的,其中关键的双金属β-甲锡烷基钯烯醇化物中间体经历了β-氢化物消除。这种方法还允许在烯酮的 β 位引入烷基和甲硅烷基。
Enantio- and Regioselective Ir-Catalyzed Hydrogenation of Di- and Trisubstituted Cycloalkenes
作者:Byron K. Peters、Jianguo Liu、Cristiana Margarita、Wangchuk Rabten、Sutthichat Kerdphon、Alexander Orebom、Thomas Morsch、Pher G. Andersson
DOI:10.1021/jacs.6b07291
日期:2016.9.14
carbons away from the olefin. Substrates having functionalities such as carboxyl groups, alcohols, or heterocycles in the vicinity of the C═C bond were hydrogenated in high enantiomeric excess (up to >99% ee). The hydrogenation was also found to be regioselective, and by controlling the reaction conditions, selective hydrogenation of one of two trisubstituted olefins can be achieved. Furthermore, trisubstituted
[AlCl<sub>3</sub> + 2THF]: A New and Efficient Catalytic System for Diels−Alder Cycloaddition of α,β-Unsaturated Carbonyl Compounds under Solvent-Free Conditions
[AlCl(3) + 2THF] is a newcatalytic system for the Diels-Aldercycloaddition under SFC and air atmosphere. By using equimolar amounts of reactants, this catalyst prevents the polymerization of the diene and allows the corresponding adducts to be isolated with high regio- and stereocontrol and in excellent yields. [reaction: see text]