Metal-Free Electrophilic Alkynylation of Sulfenate Anions with Ethynylbenziodoxolone Reagents
作者:Stephanie G. E. Amos、Stefano Nicolai、Alec Gagnebin、Franck Le Vaillant、Jerome Waser
DOI:10.1021/acs.joc.9b00050
日期:2019.3.15
Alkynyl sulfoxides are important buildingblocks with a unique reactivity in organic chemistry, but only a few reliable methods have been reported to synthesize them. A novel route to access alkynyl sulfoxides is reported herein by using ethynyl benziodoxolone (EBX) reagents to trap sulfenate anions generated in situ, via a retro-Michael reaction. The reaction takes place under metal-free and mild
“Anti-Michael addition” of Grignard reagents to sulfonylacetylenes: synthesis of alkynes
作者:Francisco Esteban、Lazhar Boughani、José L. García Ruano、Alberto Fraile、José Alemán
DOI:10.1039/c7ob00783c
日期:——
In this work, the addition of Grignardreagents to arylsulfonylacetylenes, which undergoes an “anti-Michael addition”, resulting in their alkynylation under very mild conditions is described. The simplicity of the experimental procedure and the functional group tolerance are the main features of this methodology. This is an important advantage over the use of organolithium at −78 °C that we previously
Arylsulfonylacetylenes as Alkynylating Reagents of C sp 2H Bonds Activated with Lithium Bases
作者:José Luis García Ruano、José Alemán、Leyre Marzo、Cuauhtémoc Alvarado、Mariola Tortosa、Sergio Díaz-Tendero、Alberto Fraile
DOI:10.1002/anie.201107821
日期:2012.3.12
strategy for the synthesis of a wide variety of alkynyl derivatives by the reaction of substituted arylsulfonylacetylenes with organolithium species is described (see scheme). The high yields, the simplicity of the experimental procedure, the broad scope of this reaction, and the formation of CspCbonds without using transition metals are the main features of this methodology.
Expanding the Scope of Arylsulfonylacetylenes as Alkynylating Reagents and Mechanistic Insights in the Formation of Csp<sup>2</sup>Csp and Csp<sup>3</sup>Csp Bonds from Organolithiums
作者:José Luis García Ruano、José Alemán、Leyre Marzo、Cuauhtémoc Alvarado、Mariola Tortosa、Sergio Díaz‐Tendero、Alberto Fraile
DOI:10.1002/chem.201200939
日期:2012.7.2
We describe the unexpected behavior of the arylsulfonylacetylenes, which suffer an “anti‐Michael” addition of organolithiums producing their alkynylation under very mild conditions. The broad scope, excellent yields, and simplicity of the experimental procedure are the main features of this methodology. A rational explanation of all these results can be achieved by theoretical calculations, which suggest
Reactivity of 5‐(Alkynyl)dibenzothiophenium Salts: Synthesis of Diynes, Vinyl Sulfones, and Phenanthrenes
作者:Kevin Kafuta、Christian J. Rugen、Tobias Heilmann、Tianshu Liu、Christopher Golz、Manuel Alcarazo
DOI:10.1002/ejoc.202100323
日期:2021.8.6
to their reactivity as electrophilic alkynylation reagents, they undergo regioselective additions to the C−C triple bond. The products thus obtained can be used for the synthesis of Z-vinyl sulfones and 9,10-substituted phenanthrenes.