Greener and rapid access to bio-active heterocycles: one-pot solvent-free synthesis of 1,3,4-oxadiazoles and 1,3,4-thiadiazoles
作者:Vivek Polshettiwar、Rajender S. Varma
DOI:10.1016/j.tetlet.2007.11.165
日期:2008.1
A novel one-pot solvent-free synthesis of 1,3,4-oxadiazoles and 1,3,4-thiadiazoles by condensation of acid hydrazide and triethyl orthoalkanates under microwave irradiations is reported. This green protocol was catalyzed efficiently by solid supported Nafion®NR50 and phosphorus pentasulfide in alumina (P4S10/Al2O3) with excellent yields.
报道了在微波辐射下通过酰肼与原烷基三乙基酯的缩合反应得到的一种新颖的无锅无溶剂合成1,3,4-恶二唑和1,3,4-噻二唑的方法。此绿色协议是有效地由固体负载的Nafion催化® NR50和五硫化二磷在氧化铝(P 4小号10 /的Al 2 ö 3具有优良的产率)。