Abstract
A copper-mediated C-H chalcogenation of triazoles has been achieved by weak coordination. The user-friendly protocol showed high functional-group tolerance and ample substrate scope, yielding fully substituted 1,2,3-triazoles with complete positional site-selectivity. The C-H selenylation could likewise be achieved by means of copper catalysis. Our findings highlight for the first time that weak O-coordination can outcompete the strong N,N-bidentate coordination mode in C-H functionalization technology.
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