Synthesis of quaternary carbon-centered indolo[1,2-<i>a</i>]quinazolinones and indazolo[1,2-<i>a</i>]indazolones <i>via</i> C–H functionalization
Kongkona Gogoi, Bidisha Bora, Geetika Borah, Bipul Sarma, Sanjib Gogoi
Abstract
An unprecedented Ru(ii)-catalyzed Csp2-H bond activation and annulation reaction of phenylindazolones with diaryl-substituted alkynes and dialkyl-substituted alkynes provided efficient routes for the construction of all-carbon quaternary-centered indolo[1,2-a]quinazolinones and quaternary carbon-centered indazolo[1,2-a]indazolones, respectively. The indolo[1,2-a]quinazolinones were fomed via Csp2-H activation, alkyne insertion and a 1,2-phenyl shift. Indazolo[1,2-a]indazolones were formed through a cascade reaction via the formation of exocyclic double bonds containing indolo[1,2-a]quinazolinones.
Topics & Concepts
Surface modificationChemistryCascadeQuaternary carbonCarbon fibersMedicinal chemistryCatalysisOrganic chemistryMaterials scienceEnantioselective synthesisPhysical chemistryChromatographyComposite materialComposite numberCatalytic C–H Functionalization MethodsQuinazolinone synthesis and applicationsCatalytic Cross-Coupling Reactions