咪唑稠合多杂环分子框架的合成,即。咪唑并[1,2- a ]吡咯并[3,4- e ]吡啶、咪唑并[2,1- a ]吡咯并[3,4- c ]异喹啉和苯并[ g ]咪唑并[1,2- a ]喹啉-6,11-二酮,通过钌(II)催化的2-烯基/2-芳基咪唑与N-取代的马来酰亚胺和1,4-萘醌的[4 + 2] C–H/N–H环化反应实现。所开发的方案操作简单,具有广泛的底物范围和出色的官能团耐受性,并以中等至良好的产量提供所需的产品。机理研究表明,该反应涉及通过Ru催化的C(sp 2 )-H键活化形成C-C键,然后进行分子内环化。
Palladium(0)-Catalyzed, Copper(I)-Mediated Coupling of Cyclic Thioamides with Alkenylboronic Acids, Organostannanes, and Siloxanes
作者:Nuzhat Arshad、Jamshed Hashim、C. Oliver Kappe
DOI:10.1021/jo900848s
日期:2009.7.17
The Pd-catalyzed cross-coupling of cyclic thioamides and thioureas with alkenylboronic acids, vinyl- and (het)arylstannanes, and arylsiloxanes in the presence of stoichiometric amounts of a Cu(I) cofactor is described. The desulfitative C−C cross-coupling protocol of the Liebeskind−Srogl type is performed under neutral conditions and can be applied to a range of heterocyclic structures with embedded
Ru(II)-Catalyzed [4 + 2]-Annulation of 2-Alkenyl/Arylimidazoles with <i>N-</i>Substituted Maleimides and 1,4-Naphthoquinones: Access to Imidazo-Fused Polyheterocycles
作者:Neha Meena、Dhananjay S. Nipate、Prakash N. Swami、Krishnan Rangan、Anil Kumar
DOI:10.1021/acs.joc.3c02229
日期:2024.2.16
the ruthenium(II)-catalyzed [4 + 2] C–H/N–H annulation of 2-alkenyl/2-arylimidazoles with N-substituted maleimides and 1,4-naphthoquinones. The developed protocol is operationally simple, exhibits broad substrate scope with excellent functional group tolerance, and provides the desired products in moderate to good yields. The mechanistic studies suggest that the reaction involves the formation of a
咪唑稠合多杂环分子框架的合成,即。咪唑并[1,2- a ]吡咯并[3,4- e ]吡啶、咪唑并[2,1- a ]吡咯并[3,4- c ]异喹啉和苯并[ g ]咪唑并[1,2- a ]喹啉-6,11-二酮,通过钌(II)催化的2-烯基/2-芳基咪唑与N-取代的马来酰亚胺和1,4-萘醌的[4 + 2] C–H/N–H环化反应实现。所开发的方案操作简单,具有广泛的底物范围和出色的官能团耐受性,并以中等至良好的产量提供所需的产品。机理研究表明,该反应涉及通过Ru催化的C(sp 2 )-H键活化形成C-C键,然后进行分子内环化。