Recent advances in spirocyclization of maleimides via transition-metal catalyzed C–H activation
Abstract
In recent years, the maleimide scaffold has received a great deal of attention in C–H activation. Several types of products can be constructed using maleimides as a coupling partner. Alkylation, alkenylation, annulation, dehydrogenative annulation and spirocyclization are various reactions shown by maleimides in C–H activation. Thus, the maleimide scaffold has been extensively studied in the last few years in C–H activation owing to its unique reactivity. Among the diverse class of reactions of maleimides, spirocyclization is a less explored reaction. The spirocycles, in particular the spirosuccinimides are interesting candidates in drug discovery and materials chemistry. Therefore the method of spirocyclization of maleimides via C–H activation becomes an important strategy for the synthesis of a diverse array of spirosuccinimides. This review summarizes the reports available in this field from 2015–2023 and also highlights the scopes and prospects of this method.