A competitive and highly selective 7-, 6- and 5-annulation with 1,3-migration through C–H and N–H – alkyne coupling
作者:Sk Ajarul、Anirban Kayet、Tanmay K. Pati、Dilip K. Maiti
DOI:10.1039/c9cc07360d
日期:——
We demonstrated a highly competitive and selective C-C and N-C cross-coupled 7-, 6- and 5-annulation utilizing 2-ethynylanilides to afford functionalized 1H-benzo[b]azepin-2(5H)-ones, 2-quinolinones, and 3-acylindoles in high yield. ZnCl2 was found to be the smart catalyst for 7- and 5-annulation with 1,3-migration through C-H and N-H functionalization, respectively, whereas molecular iodine performed
我们证明了利用2-乙炔基苯胺类化合物进行高度竞争和选择性的CC和NC交叉偶联7、6和5环化,可以提供官能化的1H-苯并[b]氮杂-2(5H)-酮,2-喹啉酮和3 -acylindoles高产。发现ZnCl2是7和5环化的智能催化剂,分别通过CH和NH官能化进行1,3-迁移,而分子碘以非常规的1,3 H位移进行CH官能化6环化。通过中间捕获,控制和标记实验研究了该机制。