C(sp2)-H Bond Multiple Functionalization in Air for Construction of Tetrahydrocarbazoles with Continuous Quaternary
Longlong Song1, Dan Ni1, Shikun Jia1
1Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China.
Abstract:
The C(sp2)-H function of indole ketone with diazo compound via a rhodium(II)-catalyzed intramolecular electrophilic trapping reaction under mild conditions in air was demonstrated. The established methodology provided a highly efficient approach for direct synthesis of mutisubstituted tetrahydrocarbazoles with continuous quaternary carbons. The resulting products facilitate further modification to conveniently construct tetrahydrocarbazoles with additional fused heterocyclic rings. By phenotypic screening, several products exhibit good anticancer bioctivities in osteosarcoma cell lines.
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