Substituent-Directed Regioselective Azidation: Copper-Catalyzed C–H Azidation and Iodine-Catalyzed Dearomatizative Azidation of Indole
作者:Jayaraman Dhineshkumar、Karthik Gadde、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.joc.7b02591
日期:2018.1.5
Azidation of indoles using iodine and copper bromide as catalysts under ambient reaction conditions is presented. The regioselectivity is directed by the substituent at the C3-position of indole. A radical stabilizing group such as an ester or ketone moiety at the C3-position of indole leads to azidation at the C2-position, whereas a less radical stabilizing group such as an alkyl or amide group at
提出了在环境反应条件下使用碘和溴化铜作为催化剂对吲哚进行叠氮化的方法。区域选择性由吲哚的C 3-位上的取代基指示。吲哚C3位置的自由基稳定基团(例如酯或酮部分)会导致C2位置的叠氮,而吲哚C3位置的自由基稳定性较低的基团(例如烷基或酰胺基)则提供3 -叠氮基吲哚产品。该方案温和有效地以中等至良好的产率获得了几种2-叠氮吲哚衍生物和3-叠氮恶吲哚衍生物。反应条件对于克规模的合成非常适合。