作者:Paolo Stabile、Alessandro Lamonica、Arianna Ribecai、Damiano Castoldi、Giuseppe Guercio、Ornella Curcuruto
DOI:10.1016/j.tetlet.2010.06.139
日期:2010.9
A mild, general, convenient, and efficient one-pot synthesis of 2-phenyl-5-substituted-1,3,4-oxadiazoles is described. Both (hetero)aryl and alkyl carboxylic acids were efficiently condensed with benzohydrazide in the presence of TBTU to give diacylhydrazine intermediates. The latter underwent a smooth TsCl-mediated cyclodehydration reaction to afford 2-phenyl-5-substituted-1,3,4-oxadiazoles in good to very good yields. (C) 2010 Elsevier Ltd. All rights reserved.