Sulfoximines Assisted Rh(III)-Catalyzed C–H Activation/Annulation Cascade to Synthesize Highly Fused Indeno-1,2-benzothiazines
Jian Li, Hui Li, Daqing Fang, Lingjun Liu, Xu Han, Jina Sun, Chunpu Li, Yu Zhou, Deju Ye, Hong Liu
Abstract
A facile access to highly fused tetracyclic indeno-1,2-benzothiazines has been established via a Rh(III)-catalyzed C-H bond activation and intramolecular annulation cascade between sulfoximides and all-carbon diazo indandiones. This strategy is characterized by the fact that the diazo coupling partners do not require preactivation, along with its high efficiency, broad substrate generality, and facile transformation. Particularly, the highly conjugated tetracyclic products demonstrate good optical properties and can easily enter cells to emit bright fluorescence for live cell imaging.
Topics & Concepts
AnnulationIntramolecular forceDiazoCatalysisCascadeCombinatorial chemistryChemistrySubstrate (aquarium)Conjugated systemPhotochemistryStereochemistryMedicinal chemistryOrganic chemistryOceanographyChromatographyPolymerGeologyCatalytic C–H Functionalization MethodsSynthesis and Catalytic ReactionsCyclopropane Reaction Mechanisms