The 1,3-Dipolar Cycloadditions of Nitrile Oxides and Nitrile Imines to Alkyl Dicyanoacetates
作者:Richard Neidlein、Zhihua Sui
DOI:10.1002/hlca.19910740306
日期:1991.5.2
with the 1,3-dipolar reagents arenecarbonitrile oxides 2′ and arenecarbonitrile imines 5′ to afford 1,2,4-oxadiazol and 1,2,4-triazol derivatives. The arenecarbonitrile oxides 2′ with electron-donating groups on the arene ring gave products 3a–d resulting from addition on both CN groups of 1, and those with electron-withdrawing groups provided mono-adducts 4a–e (Scheme 1). Arylnitrile imines 5′ reacted
容易得到的烷基dicyanoacetates 1与1,3-偶极试剂反应arenecarbonitrile氧化物2 '和arenecarbonitrile亚胺5 ',得到1,2,4-恶二唑和1,2,4-三唑衍生物。在芳烃环上带有给电子基团的芳烃腈氧化物2 '产生的产物3a - d是在两个CN基团1上加成而得到的,而带有吸电子基团的芳烃腈提供了单加合物4a - e(方案1)。芳腈亚胺5 '与1反应生成双加和单加产物(方案2); 双加合物8a,b具有酯结构,而单加合物6a - d具有乙烯酮-半缩醛结构。