Reaction of Pyrrole Anions with Carbon Disulfide. Synthesis of Pyrrole-3-carbodithioates
作者:Boris A. Trofimov、Lubov' N. Sobenina、Al'bina I. Mikhaleva、Andrey P. Demenev、Ol'ga A. Tarasova、Igor' A. Ushakov、Sergey V. Zinchenko
DOI:10.1016/s0040-4020(00)00641-4
日期:2000.9
5-Disubstituted pyrroles react with carbon disulfide in the system KOH–DMSO with selective formation of pyrrole-3-carbodithioate anions from which pyrrole-3-carbodithioates were prepared by ethylation in 36–61% yield. From 2-methyl-5-phenyl(2-furyl- or 2-thienyl)pyrroles only pyrrole-3-carbodithioates are formed, with no isomeric pyrrole-4-carbodithioates being present. The reaction direction depends on pyrrole
2,5-二取代的吡咯与KOH-DMSO体系中的二硫化碳反应,选择性生成3-吡咯二硫代吡咯阴离子,通过乙基化反应可制得3-吡咯二吡咯,收率为36-61%。由2-甲基-5-苯基(2-呋喃基或2-噻吩基)吡咯仅形成吡咯-3-碳化二硫代酸酯,不存在异构的吡咯-4-碳化二硫代酸酯。反应方向取决于吡咯环取代:未取代的吡咯选择性地形成吡咯-1-碳二硫代酸酯,而2-甲基-,2,3-和2,4-二甲基吡咯在相同条件下仅生成吡咯-2-碳二硫代酸酯。