The sulfonyl group, a robust protecting group for nitrogen, exhibits high stability under various conditions; however, its removal is challenging, requiring strong acidic or basic conditions potentially affecting other sensitive functional groups in the molecule. Fimognari and co-workers, in 2020, demonstrated the usage of strongly reducing 100 heteroleptic diamine-diphosphine copper (I) complex ([Cu(dq)(BINAP)]BF4) under blue LEDs for the desulfonylation of protected nitrogen-containing (hetero)aryls (Figure ). This strategy enabled the photodeprotection of indazoles, indoles, pyrazole, and imidazoles containing diverse functional groups (Figure ). In particular, the complete conversion of electron-rich indoles to the product was observed in DMF with irradiation at 427nm. 100 Furthermore, this methodology could be extended to tosyl amides.