Synthesis of Fused or Spiro Polyheterocyclic Compounds via the Dehydrogenative Annulation Reactions of 2-Arylindazoles with Maleimides
作者:Chenhao Guo、Bin Li、Huilai Liu、Xiaopeng Zhang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.9b01889
日期:2019.9.20
maleimides for the switchable synthesis of indazolo[2,3-a]pyrrolo[3,4-c]quinolinones or spiroindolo[1,2-b]indazole-11,3'-pyrrolidinones is presented. Mechanistically, the formation of the title compounds involves a Rh(III)-catalyzed C-H metalation of 2-arylindazole, followed by maleimide insertion and intramolecular cyclization. Interestingly, the selectivity to form the fused or spiro compounds could be switched
提出了2-芳基吲唑与马来酰亚胺的脱氢环化反应,用于吲哚并[2,3-a]吡咯并[3,4-c]喹啉酮或螺吲哚并[1,2-b]吲唑-11,3'-吡咯烷酮的可切换合成。 。从机理上讲,标题化合物的形成包括Rh(III)催化的2-芳基吲唑的CH金属化,然后是马来酰亚胺插入和分子内环化。有趣的是,可以通过使用不同的添加剂来改变形成稠合或螺环化合物的选择性。该协议的显着特征包括简单的底物以及出色的原子经济性和区域选择性。