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Tetrasubstituted alkenyl-1,3,4-oxadiazoles were synthesized in moderate to excellent yield, under mild conditions and in the presence of sensitive functional groups, via the cyclization of diacylhydrazides using PPh 3 and hexachloroethane in the presence of Hünig’s base. An efficient one-pot acylation/cyclization approach for the conversion of acylhydrazides to 1,3,4-oxadiazoles is also described...
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