NNNifty targets: In a straightforward copper-mediated synthesis of 1,4-disubstituted and 1,4,5-trisubstituted 1,2,3-triazoles, readily available aniline and N-tosylhydrazone substrates underwent cyclization through CN and NN bond formation (see scheme; Piv=pivaloyl, Ts=p-toluenesulfonyl). This method enables the preparation of 1,2,3-triazoles with high efficiency under mild conditions without the use of azides.
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Chen et al. (2013) studied this question.
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