Stereoselective preparation of 1,2,4-oxadiazole derivatives substituted by pentafluorophenyl by 1,3-dipolar cycloaddition reaction
作者:Huiling Jiang、Jingwei Zhao、Xiaobing Han、Shizheng Zhu
DOI:10.1016/j.tet.2006.06.119
日期:2006.11
reactions of chiral imines obtained from optically active amino acids with nitrile oxides afforded 1,2,4-oxadiazole derivatives in moderate to good yields with good stereoselectivity. Investigation on the effect of bases suggested that triethylamine was prone to afford better stereoselectivity, while NaHCO3 was prone to increase the reaction rates and yields.
由旋光性氨基酸获得的手性亚胺与腈氧化物的1,3-偶极环加成反应以中等到良好的收率和良好的立体选择性提供了1,2,4-恶二唑衍生物。对碱的作用的研究表明,三乙胺倾向于提供更好的立体选择性,而NaHCO 3倾向于提高反应速率和产率。