Regioselectivity of nitrilimines 1,3-dipolar cycloaddition: Novel synthesis of spiro[4,4]nona-2,8-dien-6-one derivatives
作者:Omar A. Miqdad、Nada M. Abunada、Hamdi M. Hassaneen
DOI:10.1002/hc.20666
日期:——
Regioselective 1,3-dipolar cycloaddition of nitrilimines (generated in situ from dehydrohalogenation of the corresponding hydrazonoyl halides by the action of triethylamine) with 4-arylidene-1-aryl-2-phenyl-1H-imidazol-5(4H)-one 3 afforded the corresponding spiro[4,4]nona-2,8-dien-6-one 4. The reaction was carried out in dry benzene under reflux temperature. Refluxing in acetic acid, 4a was converted
腈亚胺的区域选择性 1,3-偶极环加成反应(由三乙胺作用下相应腙酰卤的脱卤化氢原位生成)与 4-亚芳基-1-芳基-2-苯基-1H-咪唑-5(4H)-one 3得到相应的螺[4,4]nona-2,8-dien-6-one 4。反应在无水苯中在回流温度下进行。在乙酸中回流,4a 转化为其各自的 N-苯基吡唑-5-甲酰胺 8。制备的化合物的结构通过元素分析和光谱数据(IR、MS、1H 和 13C NMR)确定。© 2011 Wiley Periodicals, Inc. 杂原子化学 22:131–136, 2011; 在 wileyonlinelibrary.com 上在线查看这篇文章。DOI 10.1002/hc.20666