A versatile synthesis of benzothieno-annelated 1,2-dihydropyridine and 1,2,3,4-tetrahydropyridine derivatives: the effect of the structure of benzothieno-annelated pyridinium salts on their reduction by sodium borohydride
作者:Maksym A. Kryuchkov、Roman I. Zubatyuk、Igor F. Perepichka、Oleg V. Shishkin、Sergei V. Tolkunov
DOI:10.1007/s00706-009-0222-7
日期:2010.1
One-pot synthesis of benzothieno[3,2-g]indolizinium salts from 1-(3-chloropropyl)-benzothieno[2,3-c]pyrylium included consequent recyclization of the pyrylium core by ammonia into a pyridine intermediate and its further intramolecular quaternization reaction. Depending on the structure of benzothieno-annelated pyridinium salts, their reaction with sodium borohydride in methanol results in reduction of the
摘要苯并噻吩并[2,3- c ^ ]吡啶鎓和苯并噻吩并[2,3- c ^ ]喹啉盐是由苯并噻吩并[2,3-的季铵化作用中合成Ç ]吡啶,苯并噻吩或再成环的[2,3- c ^ ]吡喃鎓盐与伯胺。从1-(3-氯丙基)-苯并噻吩并[2,3- c ]一锅合成苯并噻吩并[3,2- g ]吲哚并鎓盐] included包括随后通过氨将吡啶核芯再循环到吡啶中间体中及其进一步的分子内季铵化反应。取决于苯并噻吩并退火的吡啶鎓盐的结构,它们与硼氢化钠在甲醇中的反应导致吡啶核还原成四氢吡啶或二氢吡啶衍生物。还原苯并噻吩并[2,3- c ]吡啶鎓盐和苯并噻吩并[3,2- g ]吲哚并鎓盐很容易得到苯并噻吩并退火的四氢吡啶,为立体异构体的复杂混合物,而苯并噻吩并[2,3- c ]喹啉鎓盐的还原导致二氢吡啶衍生物。后者的结构尤其通过单晶X射线衍射分析来确认。 图形概要