Copper-Catalyzed Asymmetric Conjugate Addition with Chiral SimplePhos Ligands
作者:Laëtitia Palais、Alexandre Alexakis
DOI:10.1002/chem.200901577
日期:2009.10.12
they can be highly functionalised. Herein we report the copper‐catalysed asymmetricconjugateaddition of diethyl zinc and trialkylaluminium reagents with SimplePhos ligands, which gives high enantioselectivity with cyclic enones, acyclic enones and nitro‐olefins, with up to 98.6 % ee. Of particular interest is the reaction of trialkylaluminium reagents with a wide range of 3‐substituted enones, thus
Synthesis of Carbocycles via Intramolecular Conjugate Additions: Total Syntheses of Axane Sesquiterpenoids
作者:Alyx-Caroline Guevel、David J. Hart
DOI:10.1021/jo951532e
日期:1996.1.1
Syntheses of (+/-)-axamide-1 (2) and (+/-)-axisonitrile-1 (1) are described. The syntheses require 12 steps and 13 steps, respectively, from vinylogous ester 8 and feature the diastereoselective cyclization of unsaturated ester 7 to perhydroindan 5. Some interesting reactions of the organometallic derived from [(trimethylsilyl)methyl]magnesium chloride and cerium trichloride are also described.
AlCl<sub>3</sub>‐Promoted Conia‐Ene‐Related Cyclization of α,ω‐Diethylenic Ketones and 1,2‐ or 1,3‐Hydroalkenylation of Unactivated Cyclopropanes
作者:Julien Coulomb
DOI:10.1002/adsc.202300317
日期:2023.9.5
α,β-Unsaturated enones possessing an unactivated olefin at the ϵ-, ζ- or η-position underwent an aluminum chloride-promoted Conia-ene-related cyclization, affording unsaturated decalones or hexahydroindenones in generally good yields. Cyclopropanes could be used as olefin surrogates in this process, leading to the same bicyclic products in slightly improved efficiency as the result of 1,2- or 1,3-hydroalkenylation
Organic Dye-Sensitized Nitrene Generation: Intermolecular Aziridination of Unactivated Alkenes
作者:Dennis Dam、Nathan R. Lagerweij、Katharina M. Janmaat、Ken Kok、Elisabeth Bouwman、Jeroen D. C. Codée
DOI:10.1021/acs.joc.3c02709
日期:2024.3.1
intermediates, and several synthetic strategies for the direct aziridination of alkenes have been introduced. However, many of these strategies require an excess of activated alkene, suffer from competing side-reactions, have limited functional group tolerance, or involve precious transition metal-based catalysts. Herein, we demonstrate the direct aziridination of alkenes by combining sulfonyl azides as a triplet
Directed Hydrogen Atom Transfer for Selective Reactions of Polyenols
作者:Daniel E. Essayan、Matthew J. Schubach、Jeanelle M. Smoot、Taranee Puri、Sergey V. Pronin
DOI:10.1021/jacs.4c06601
日期:2024.7.10
catalyzed by iron complexes and allows for the site-selective hydrofunctionalization of polyenols. Experimental data suggest that coordination of the hydroxygroup to the iron hydride intermediate plays an important role in preferential engagement of the allylic alcohol motif and provides a new basis for selectivity in radical hydrofunctionalization events. As a proof of concept, β- and γ-amino alcohols