Nickel-catalyzed direct alkynylation of C(sp<sup>2</sup>)–H bonds of amides: an “inverse Sonogashira strategy” to ortho-alkynylbenzoic acids
作者:Vinod G. Landge、Chinmay H. Shewale、Garima Jaiswal、Manoj K. Sahoo、Siba P. Midya、Ekambaram Balaraman
DOI:10.1039/c5cy01299f
日期:——
Nickel-catalyzed direct alkynylation of C(sp2)–Hbonds of amides using commercially available, inexpensive 8-aminoquinoline as a removable bidentate directing group is described. The present ortho-alkynylation has a broad substrate scope, functional group tolerance and high regiocontrol, and can be scaled up. The efficiency and selectivity of this strategy provide sustainable routes to a diverse array of ortho-alkynylbenzoic
developed for the mono- and bis-ortho-C–H alkynylation of easily accessible benzamide derivatives using alkynyl bromides at roomtemperature by merging cobalt and photocatalysts. The diverse reactivity of various alkynyl bromides towards the C–H alkynylation and competing C–H/N–H bond annulation reactions has been demonstrated to give the corresponding products in good yields with excellent functional
Palladium-Catalyzed Direct <i>ortho</i>-Alkynylation of Aromatic Carboxylic Acid Derivatives
作者:Yusuke Ano、Mamoru Tobisu、Naoto Chatani
DOI:10.1021/ol203100u
日期:2012.1.6
The palladium-catalyzed directalkynylation of C–H bonds in aromatic carboxylicacid derivatives is described. The use of 8-aminoquinoline as a directing group facilitates the alkynylation of an electronically diverse range of C(sp2)–H bonds.
Nickel-Catalyzed Alkynylation of a C(sp<sup>2</sup>)–H Bond Directed by an 8-Aminoquinoline Moiety
作者:Jun Yi、Li Yang、Chungu Xia、Fuwei Li
DOI:10.1021/acs.joc.5b00669
日期:2015.6.19
nickel catalyst system for the directortho C–H alkynylation of the amides has been successfully developed with the directing assistance of 8-aminoquinoline. It was found that the flexible bis(2-dimethylaminoethyl) ether (BDMAE) ligand was critical to achieve the optimized reactivity. This protocol showed good tolerance toward not only a wide range of (hetero)aryl amides but also the rarely studied α