作者:Zen-ichi Yoshida、Hideo Hirai、Sadao Miki、Shigeo Yoneda
DOI:10.1016/s0040-4020(01)80147-2
日期:1989.1
heterocycle synthesis using trithiocyclo-propenium salt as a building bock is described. Tris(tert -butylthio)cyclopropenium perchlorate (1) reacts with β-amino acids under basic conditions to give 1,2-dihydropyridines, where cyclopropenium salt serves as the three carbon homologator in heterocyclic ring formation. The selective syntheses of 1,5-benzodiazepines and benzimidazoles from 1 are also described
描述了一种新的杂环合成方法,该方法使用三硫代环-丙烯盐作为合成物。在碱性条件下,三(叔-丁基硫代)环丙酸高氯酸盐(1)与β-氨基酸反应生成1,2-二氢吡啶,其中环丙烯盐充当杂环形成中的三碳同系物。还描述了由1选择性合成1,5-苯并二氮杂卓和苯并咪唑。1与邻苯二胺在二甲基甲酰胺中的反应生成1,5-苯并二氮杂s为单一产物,但在甲醇苯并咪唑中为单一产物。1,5-苯并二氮杂卓和苯并咪唑的选择性形成可以通过溶剂参与环化步骤来解释。