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Copper-catalyzed decarboxylative regioselective synthesis of 1,5-disubstituted 1,2,3-triazoles. 2018
Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow 226031, India. dratulsax@gmail.com atul_kumar@cdri.res.in.
A copper-catalyzed decarboxylative regioselective protocol for the synthesis of 1,5-disubstituted 1,2,3-triazoles through direct annulation of cinnamic acids with aryl azides has been developed. This is the first example of 1,5-disubstituted 1,2,3-triazoles, under aerobic conditions using Cu(ii) as the catalyst, which were generally synthesized using a ruthenium(ii) catalyst. The simplicity and regioselectivity of this methodology, complementing to the classical CuAAC catalyzed the synthesis of 1,4-disubstituted 1,2,3-triazoles.
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