<i>N</i>-Sulfonylcarboxamide as an Oxidizing Directing Group for Ruthenium-Catalyzed C-H Activation/Annulation
作者:Elina Petrova、Dace Rasina、Aigars Jirgensons
DOI:10.1002/ejoc.201601582
日期:2017.4.3
N-Sulfonylcarboxamides can act as both a directinggroup for C–H activation and an internal oxidant in the Ru-catalyzedannulation reaction with alkynes to give isoquinolones. Of all of the N-sulfonylcarboxamides that were studied, the N-(2,6-difluorophenyl)sulfonamide derivatives were found to be the most efficient and led to the formation of an unstable sulfinate byproduct that decomposed into 1
An efficient rhodium-catalyzed direct C-H activation for the synthesis of isoquinolone with 1,4,2-dioxazol-5-ones as oxidizing directing groups have been developed, which featured mild reaction conditions, short reaction time and satisfactory yield.
N-Iminopyridinium ylide-directed, cobalt-catalysed coupling of sp<sup>2</sup> C–H bonds with alkynes
作者:Se Hun Kwak、Olafs Daugulis
DOI:10.1039/d0cc05294a
日期:——
N-Iminopyridinium ylides are used as directing groups and internal oxidants for cobalt-catalysed annulation of sp2 C–H bonds with internal alkynes. The reactions possess excellent compatibility with heterocyclic substrates.
Sulfoximine-Directed Ruthenium-Catalyzed <i>ortho</i>-C–H Alkenylation of (Hetero)Arenes: Synthesis of EP3 Receptor Antagonist Analogue
作者:M. Ramu Yadav、Raja K. Rit、Majji Shankar、Akhila K. Sahoo
DOI:10.1021/jo5008465
日期:2014.7.3
The reusable sulfoximine directing-group-assisted Ru(II)-catalyzed chemo- and regioselective ortho-C-H alkenylation of arenes and heteroarenes with acrylates and alpha,beta-unsaturated ketones/vinyl sulfone is shown. The N-aroyl sulfoximine undergoes annulation with diphenylacetylene, delivering isoquinolinones and methyl phenyl sulfoxide. The present protocol is successfully employed for the synthesis of the EP3 receptor antagonist analogue.
Sulfilimines as Transformable and Retainable Directing Groups in Rhodium-Catalyzed <i>ortho</i>-C–H Bond Functionalization