Modular synthesis of pyrrolo[2,1-b]thiazoles and related monocyclic pyrrolo structures
作者:Emma E. O'Dwyer、Nessa S. Mullane、Timothy P. Smyth
DOI:10.1002/jhet.550
日期:2011.3
A modular synthesis of selectively‐substituted pyrrolo[2,1‐b]thiazoles (Δ6 isomeric form) has been implemented, involving a distinctive bicyclization reaction of a mucobromic acid derivative followed by a Suzuki‐Miyaura coupling. A novel process of Δ6 to Δ7 isomerization of the pyrrolothiazole structure was uncovered that appears to involve a 1,4‐addition‐1,2‐elimination mechanism. Preparation of 1
选择性地取代的吡咯并[2,1-的模块化合成b ]噻唑(Δ 6异构体形式)已被实施,涉及mucobromic酸衍生物,接着通过Suzuki-Miyaura偶联的显着bicyclization反应。Δ的新方法6到Δ 7异构化pyrrolothiazole结构的被揭露,似乎涉及1,4-加成-1,2-消除机理。通过在还原胺化过程中使用粘溴酸合成子,还可以制备在3和4位被选择性取代的1,5-二氢吡咯-2-酮结构。J.杂环化学。(2011)。