An efficient PIDA (phenyliodine(III) diacetate)-promoted positional selective CÀ H selenylations of indolines with diaryl diselenides has been developed. This transformation conducted under mild reaction conditions with a broad functional group tolerance, thus providing an efficient protocol to selenylated indolines. Preliminary mechanistic studies indicated a SET pathway was likely involved in this selenylation reaction.

This review summarizes recent advances in C–S and C–Se formations via transition metal-catalyzed C–H functionalization utilizing directing groups to control the site-selectivity.

A sustainable and highly efficient cobaltaelectro-catalyzed C–H/N–H functionalization with allenes was developed featuring electro-reductive hydrazide cleavage.