Chem. Commun., 2026, Accepted Manuscript DOI: 10.1039/D6CC02880B, Communication Jianfeng Wen, Mengqi Wang, Wenli Liu , Tangmei Li, Jun Xu Deformylative functionalization is a promising but difficult route to value-added molecules. Continuing our work on metal-free indole oxidation, we report a mild, solvent-controlled deformylative oxidative rearrangement of 2-formylindoles to 2-oxindoles...