提出了1-炔基咪唑的反应,包括它们的2-硫代衍生物的形成,然后加入醛或酮。该方法提供了在AuCl 3-或碱催化的条件下进行6-内-挖或5- exo-挖环化反应的1-炔基-2-(羟甲基)咪唑,生成咪唑并[1,2- c ]恶唑和咪唑并[2,1- c ] [1,4]恶嗪杂环。在过渡金属催化下,该反应以区域特异性方式发生,仅导致6 -endo-dig攻击的产物,而在碱性条件下,该反应以区域选择性方式发生,优先提供5 -exo-dig攻击的产物。。
Lithiation and functionalization of 1-alkynylimidazoles at the 2-position
作者:Christophe Laroche、Sean M. Kerwin
DOI:10.1016/j.tetlet.2009.06.133
日期:2009.9
Functionalization reactions of 1-alkynylimidazoles involving the formation of their 2-lithio derivatives followed by addition of various electrophiles are presented. This allows access to previously unreported 1,2-dialkynylimidazoles via 1-alkynyl-2-iodoimidazoles. The use of an aldehyde or sulfonimine electrophiles allows the direct formation of bicyclic ring systems. (C) 2009 Elsevier Ltd. All rights reserved.