Electrochemical Oxidation Involving Sulfonyl Hydrazine for the Synthesis of 2‐Sulfonyl Quinolines/Pyridines

Abstract A mild electrochemical method was developed for the direct C2 sulfonylation of heteroaromatic N ‐oxides with sulfonyl hydrazides to obtain a serial of 2‐sulfonyl quinoline/pyridine derivatives. The method has simple conditions, using potassium carbonate as base, CH 3 CN/H 2 O (9 : 1) as solvent, and reacting for 3 h under 15 mA current to prepare expected products.