The use of a Mitsunobu reagent for the formation of heterocycles: a simple method for the preparation of 3-alkyl-5-aryl-1,3,4-oxadiazol-2(3H)-ones from carboxylic acids

3-Alkyl-1,3,4-oxadiazol-2(3H)-ones were prepared in a one-pot reaction using carboxylic acids and a Mitsunobu reagent.