C(sp)–C(sp<sup>3</sup>) Bond Formation through Cu-Catalyzed Cross-Coupling of<i>N</i>-Tosylhydrazones and Trialkylsilylethynes
作者:Fei Ye、Xiaoshen Ma、Qing Xiao、Huan Li、Yan Zhang、Jianbo Wang
DOI:10.1021/ja3004792
日期:2012.4.4
Copper-catalyzed cross-coupling of N-tosylhydrazones with trialkylsilylethynes leads to the formation of C(sp)-C(sp(3)) bonds. Cu carbene migratory insertion is proposed to play the key role in this transformation.
Exploring Skeletal Diversity via Ring Contraction of Glycal-Derived Scaffolds
作者:Adam R. Yeager、Geanna K. Min、John A. Porco,、Scott E. Schaus
DOI:10.1021/ol0618252
日期:2006.10.1
Arylether C-glycoside scaffolds have been prepared from tri-O-acetyl-D-glucal by C-glycosylation followed by allylic substitution with phenols mediated by Pd(0). The arylethers were subjected to either [3,3]-sigmatropic rearrangement to produce 3-pyranyl-phenols or Au(III)-mediated ring contraction to create highly substituted tetrahydrofurans. [structure: see text]
On the Regioselectivity of the Nickel-Catalyzed Insertion of Alkynes into the Carbon–Carbon Bond of Oxetan-3-one
作者:Christophe Aïssa、Manuel Barday、Christopher Janot、Daniel Clare、Caitlin Carr-Knox、Bradley Higginson、Kelvin Ho
DOI:10.1055/s-0036-1589052
日期:2017.8
of unsymmetrical alkynes into the carbon–carbonbond of oxetan-3-one in the presence of a nickel catalyst has revealed a strong directing effect of a 2-thienyl substituent. This effect is larger than those of 2-vinylbenzene, trimethylsilyl, aryl, or 3-thienyl groups. The study of the regioselectivity of insertion of unsymmetrical alkynes into the carbon–carbonbond of oxetan-3-one in the presence of
Titanium-Promoted Cross-Coupling for the Selective Synthesis of Polysubstituted, Conjugated Amides
作者:Vinoth Kumar Chenniappan、Ronald J. Rahaim
DOI:10.1021/acs.orglett.6b02537
日期:2016.10.7
α,β-Unsaturated amides are important buildingblocks and are key structural elements in a number of biologically active natural products. Despite their importance and prevalence, few methods exist to prepare conjugated amides directly and modularly. To address this gap, a titanium-promoted coupling of alkynes and isocyanates has been developed. The method is highly stereoselective, producing only the
Nickel-catalyzed cross-coupling of primary alkyl halides with phenylethynyl- and trimethylsilyethynyllithium reagents
作者:Guoqiang Xu、Xiaoyan Li、Hongjian Sun
DOI:10.1016/j.jorganchem.2011.05.017
日期:2011.9
coupling system is described which is promoted by a well-defined and moisture-stable pincer complex [NiClC6H3-2,6-(OPPh2)2}] (1). Non-activated alkyl halides could be efficiently coupled with phenylethynyl- and trimethylsilylethynyllithium reagents at room temperature. Compared to the alkylation of primary alkyl halides with alkynyllithium reagents in literatures, this method requires milder conditions
描述了一种高效的烷基-炔基偶联体系,该体系由定义明确且耐湿的夹钳络合物[NiCl C 6 H 3 -2,6-(OPPh 2)2 }](1)促进。未活化的烷基卤化物可以在室温下与苯基乙炔基-和三甲基甲硅烷基乙炔基锂试剂有效偶联。与文献中使用炔基锂试剂将卤代烷基卤化物进行烷基化相比,该方法需要较温和的条件(室温)并且进展迅速。这项研究将使这些易于获得的炔基锂试剂对于有机合成更加有用。