Nickel-Catalyzed Isomerization/Allylic Cyanation of Alkenyl Alcohols
作者:Ying Ding、Jinguo Long、Feilong Sun、Xianjie Fang
DOI:10.1021/acs.orglett.1c02143
日期:2021.8.6
Herein reported is a nickel-catalyzed isomerization/allylic cyanation of alkenyl alcohols, which complements current methods for the allylic substitution reactions. The specific diphosphite ligand and methanol as the solvent are crucial for the success for this transformation. A gram-scale regioconvergent experiment and formal synthesis of quebrachamine demonstrate the high potential of this methodology
A Radical Version of the Bromo- and the Iodocyclization of Bis(homoallylic) Alcohols— The Synthesis of Halogenated Tetrahydrofurans by Stereoselective Alkoxyl Radical Ring Closures
A new synthesis of bromo- and iodomethyl-substituted tetrahydrofurans has been devised. The sequence starts with the conversion of aryl-functionalized bis(homoallylic) alcohols 1 into N-alkenoxythiazole-2(3H)-thiones 6 or pyridine-2(1H)-thiones 7. When photolyzed in the presence of appropriate trapping reagents, thiones 6 and 7 efficiently liberated substituted 4-penten-1-oxyl radicals 2, which underwent
Herein we describe a nickel-catalyzed remote hydrosilylation of unconjugated enones with bulky triphenylsilane. A range of Z-silyl enolethers are obtained as major isomers due to the process of nickel triggered alkene isomerization. Notably, some specific alkyl silyl enolethers can be prepared from this protocol, which are not easily accessed by the traditional strategy using a strong base and chlorosilane
Cobalt-Catalyzed Stereoselective Synthesis of 2,5-<i>trans</i>-THF Nitrile Derivatives as a Platform for Diversification: Development and Mechanistic Studies
作者:Sajjad Ali、Henrique Milanezi、Tânia M. F. Alves、Cláudio Francisco Tormena、Marco A. B. Ferreira
DOI:10.1021/acs.joc.8b00575
日期:2018.8.3
straightforward protocol integrating a sustainable approach for the synthesis of new 2,5-trans-THF nitrile derivatives enabling an easy diversification of its side chain scaffolds is described. The reaction tolerated different aromatic and alkyl substituents, affording the corresponding 2,5-trans-THFs in high diastereoselectivity. A detailed mechanisticstudy using DFT calculation reveals details of the ligand-exchange
Hypocholesterolemic Agents IV: Inhibition of β‐Hydroxy‐β‐Methylglutaryl Coenzyme A Reductase by Arylalkenyl and Arylepoxy Hydrogen Succinates and Glutarates
作者:Marvin R. Boots、Paul E. Marecki、Sharon G. Boots、Kenneth E. Guyer
DOI:10.1002/jps.2600650523
日期:1976.5
Abstract Two series of half acid esters of succinic and glutaric acids were synthesized and assayed for inhibition of rat liver β‐hydroxy‐β‐methylglutaryl coenzyme A reductase. Irreversible inhibition was studied by incorporation of a potential alkylating group (the epoxide function) into the side chain of the alcohol portion of the half acid esters. Incorporation of a terminal olefin function into