system was found to promote the Csp2–N bond-forming reaction utilizing N-tosylhydrazones and N-H azoles. This process shows functional group tolerance; di-, tri-, and tetrasubstituted N-vinylazoles were obtained in high yields. Under the optimized conditions, the reaction proceeds with high stereoselectivity depending on the nature of the coupling partners.
synthetic approach to access a variety of 3-(indol-3-yl)quinoxalin-2-ones from various quinoxalin-2-ones and very wide scope of indoles through TfOH-catalyzed Friedel–Craftstypecoupling reaction in DMF has been developed. Only 10 mol % Brønstedacid as a catalyst, air as an oxidizer, and very wide range of substrates are the prominent advantages of this method.
Oxidative cross-coupling of quinoxalinones with indoles enabled by acidochromism
作者:Jie Huang、Long Wang、Xiang-Ying Tang
DOI:10.1039/d3ob00280b
日期:——
An oxidative cross-coupling of quinoxalinones with indole derivatives via B(C6F5)3·H2O induced acidochromism of quinoxalinone derivatives was developed under mild and external photocatalyst-free conditions. The reaction shows excellent substrate scope, accommodating a wide range of functional groups. The usefulness of this strategy was demonstrated by the synthesis of the natural products Azacephalandole
在温和和无外部光催化剂的条件下,通过B(C 6 F 5 ) 3 ·H 2 O 诱导的喹喔啉酮衍生物的酸致变色,建立了喹喔啉酮与吲哚衍生物的氧化交叉偶联。该反应显示出出色的底物范围,可容纳各种官能团。通过高产率合成天然产物 Azacephalandole A 和 Cephalandole A,证明了该策略的有效性。此外,这些产物是荧光团,具有广泛的发射范围和良好的相对量子产率,具有普遍的荧光特性。