A Copper-Catalyzed Tandem C-H <i>ortho</i>
-Hydroxylation and N-N Bond-Formation Transformation: Expedited Synthesis of 1-(<i>ortho</i>
-Hydroxyaryl)-1<i>H</i>
-indazoles
作者:Cheng-yi Chen、Fengxian He、Guangrong Tang、Han Ding、Zhaobin Wang、Dawei Li、Lujiang Deng、Roger Faessler
DOI:10.1002/ejoc.201701149
日期:2017.12.8
A Cu‐catalyzed C(sp2)–H ortho‐hydroxylation and N–N bond‐formation sequence is described for the synthesis of 1‐(ortho‐hydroxyaryl)‐1H‐indazoles by using pure oxygen as the terminal oxidant. The ortho‐arylamino N–H ketimine moiety serves as an effective directing group for C(sp2)–H oxidation. acac = acetylacetonate.
描述了Cu催化的C(sp 2)–H邻羟基化和N–N键形成顺序,该过程通过使用纯氧作为末端氧化剂合成1-(邻羟基芳基)-1 H-吲唑。的邻-arylamino N-H基团的酮亚胺用作C(SP的有效定向基团2)-H的氧化。acac =乙酰丙酮酸。