Valerie Declerck, Loic Toupet, Jean Martinez and Frederic Lamaty
Selective [3 + 2] Huisgen Cycloaddition. Synthesis of Trans-Disubstituted Triazolodiazepines from Aza-Baylis−Hillman Adducts
J. Org. Chem., 2009, 74 (5), pp 2004–2007
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http://dx.doi.org/10.1021/jo802533d