Efficient Synthesis of 1,3,4-Oxadiazoles Conjugated to Thiophene or Furan Rings via an Ethenyl Linker
作者:Agnieszka Kudelko、Karolina Jasiak
DOI:10.1055/s-0033-1338454
日期:——
synthesis of 5-substituted 2-[2-(2-furyl)ethenyl]-1,3,4-oxadiazoles and 2-[2-(2-thienyl)ethenyl]-1,3,4-oxadiazoles by cyclocondensation of the appropriate 3-(2-furyl)- and 3-(2-thienyl)acrylohydrazides with triethyl orthoesters in the presence of glacial acetic acid is reported. The formation of symmetrically substituted 2,5-bis[2-(2-furyl)ethenyl]-1,3,4-oxadiazole and 2,5-bis[2-(2-thienyl)ethenyl]-1,3
摘要 5-取代的2- [2-(2-呋喃基)乙烯基] -1,3,4-恶二唑和2- [2-(2-噻吩基)乙烯基] -1,3,4-恶二唑的新型有效合成据报道,在冰醋酸存在下,通过适当的3-(2-呋喃基)-和3-(2-噻吩基)丙烯酰肼与原酸三乙酯的环缩合反应。对称取代的2,5-双[2-(2-呋喃基)乙烯基] -1,3,4-恶二唑和2,5-双[2-(2-噻吩基)乙烯基] -1,3,4的形成还描述了在氯氧化磷的作用下,由相应的N,N'-二酰基肼生成的-oxadiazole。 5-取代的2- [2-(2-呋喃基)乙烯基] -1,3,4-恶二唑和2- [2-(2-噻吩基)乙烯基] -1,3,4-恶二唑的新型有效合成据报道,在冰醋酸存在下,通过适当的3-(2-呋喃基)-和3-(2-噻吩基)丙烯酰肼与原酸三乙酯的环缩合反应。对称取代的2,5-双[2-(2-呋喃基)乙烯基] -1,3,4-恶二唑和2,5-双[2-(2-噻吩基)乙烯基]