Synthesis of spirosuccinimides <i>via</i> annulative cyclization between <i>N</i>-aryl indazolols and maleimides under rhodium(<scp>iii</scp>) catalysis

Abstract

The rhodium(III)-catalyzed spiroannulation reaction between <i>N</i>-aryl indazol-3-ols and maleimides is described herein. The developed method is showcased by the construction of spirosuccinimides using bioactive molecule-linked and chemical probe-linked maleimides. Combined mechanistic investigations including the determination of an isolable rhodacycle complex aided the elucidation of a plausible reaction mechanism.