New efficient synthesis of bis-1,2,4-oxadiazole derivatives
 via subsequent Staudinger/aza-Wittig reaction

A convenient route for the synthesis of bis-1,2,4-oxadiazoles is described.One-pot reaction of diazidoglyoxime esters and triphenylphosphine produced bis-1,2,4-oxadiazole derivatives in good overall yields by subsequent Staudinger/aza-Wittig reaction.All compounds were characterized by IR, 1 HNMR, 13 CNMR and HRMS and the structure of key product was unequivocally confirmed by X-ray diffraction analysis.