Highly Regioselective Radical Transformation of N-Sulfonyl-1,2,3-triazoles in Air.

The classic transformations of N-sulfonyl-1,2,3-triazoles were processed via nitrogen anion (hydrolysis, etc.) and carbene intermediates, and no efficient examples via radical intermediates were developed. Here, we reported a catalyst-free radical chain transformation of N-sulfonyl-1,2,3-triazoles to access an intermolecular oxidative C(sp3)-H coupling to yield N2-selective products in air without any catalysts.