Eight 5-substituted-1,3,4-oxadiazole-2-ones were synthesized using substituted benzoic hydrazides as starting materials and triphosgene as cyclization reagent at ambient temperature with high purity and good yields.Th...Eight 5-substituted-1,3,4-oxadiazole-2-ones were synthesized using substituted benzoic hydrazides as starting materials and triphosgene as cyclization reagent at ambient temperature with high purity and good yields.Their structures were characterized by IR,MS,1H NMR and elemental analysis.The salient features of this method included the simple reaction set-ups,safety,short reaction time and high yields of products.展开更多
Formylchrone reacted with aroylhydrazine to give corresponding hydrazone, which was treated with acetic anhydride to give a series of chromones with substitution of 1,3,4 dihydrooxadiazoly in 3 position. The chromone ...Formylchrone reacted with aroylhydrazine to give corresponding hydrazone, which was treated with acetic anhydride to give a series of chromones with substitution of 1,3,4 dihydrooxadiazoly in 3 position. The chromone formation reaction could be finished in a much short time by microwave irradiation heating.展开更多
文摘Eight 5-substituted-1,3,4-oxadiazole-2-ones were synthesized using substituted benzoic hydrazides as starting materials and triphosgene as cyclization reagent at ambient temperature with high purity and good yields.Their structures were characterized by IR,MS,1H NMR and elemental analysis.The salient features of this method included the simple reaction set-ups,safety,short reaction time and high yields of products.
文摘Formylchrone reacted with aroylhydrazine to give corresponding hydrazone, which was treated with acetic anhydride to give a series of chromones with substitution of 1,3,4 dihydrooxadiazoly in 3 position. The chromone formation reaction could be finished in a much short time by microwave irradiation heating.
