Ultrasound-assisted 1,3-dipolar cycloaddition and cyclopropanation reactions for the synthesis of bis-indolizine and bis-cyclopropane derivatives
作者:Mehdi Abaszadeh、Mohammad Seifi
DOI:10.1039/c4ob01305k
日期:——
Ultrasound irradiation can promote the 1,3-dipolar cycloaddition reaction of 2-chloropyridinium ylides with 2-benzylidenemalononitrile or 2,2′-(1,4-phenylenebis(methanylylidene))dimalononitrile, to afford the indolizine and bis-indolizine derivatives respectively. While the reaction of pyridinium ylides with 2-benzylidenemalononitrile or 2,2′-(1,4-phenylenebis(methanylylidene))dimalononitrile under ultrasound irradiation provided, in an unusual manner, cyclopropane and bis-cyclopropane derivatives, respectively. These cycloaddition and cyclopropanation reactions were carried out in the presence of triethylamine, in acetonitrile, at room temperature.
超声辐照可促进2-氯吡啶叶立德与2-亚苄基丙二腈或2,2'-(1,4-亚苯基双(亚甲基))二丙二腈发生1,3-偶极环加成反应,分别得到中氮茚和双中氮茚衍生物。而吡啶鎓叶立德与2-亚苄基丙二腈或2,2'-(1,4-亚苯基双(亚甲基))二丙二腈在超声波照射下的反应则以不寻常的方式分别提供环丙烷和双环丙烷衍生物。这些环加成和环丙烷化反应是在三乙胺存在下、在乙腈中、在室温下进行的。