Four-component Synthesis of 1,3,4-Oxadiazole Derivatives from (N-Isocyanimino)triphenylphosphorane, (E)-Cinnamic Acids, Acetaldehyde and Secondary Amines
作者:Ali Ramazani、Yavar Ahmadi、Fatemeh Zeinali Nasrabadi
DOI:10.1515/znb-2011-0211
日期:2011.2.1
secondary amine to acetaldehyde is trapped by the (N-isocyanimino)triphenylphosphorane in the presence of an (E)-cinnamic acid derivative, leading to the formation of the corresponding iminophosphorane intermediate. Disubstituted 1,3,4-oxadiazole derivatives are formed via intramolecular aza-Wittig reaction of the iminophosphorane intermediates. The reactions were completed under neutral conditions at room
在 (E)-肉桂酸衍生物存在下,通过将仲胺加成到乙醛中生成的 1:1 亚胺中间体被(N-异氰基亚氨基)三苯基正膦捕获,导致形成相应的亚氨基正膦中间体。双取代的 1,3,4-恶二唑衍生物是通过亚氨基膦中间体的分子内氮杂-维蒂希反应形成的。反应在室温下中性条件下完成,相应的双取代 1,3,4-恶二唑衍生物以优异的产率产生。从(N-异氰亚氨基)三苯基正膦、(E)-肉桂酸、乙醛和仲胺四组分合成 1,3,4-恶二唑衍生物的图形摘要