已开发出在 K 2 S 2 O 8作为氧化剂存在下,用 CF 3 SO 2 Na对吡咯并[1,2- a ]喹喔啉进行有效的 Cu(II) 催化直接 C-H 三氟甲基化反应。各种 C1-三氟甲基化吡咯并[1,2- a ]喹喔啉可以以中等至良好的收率获得。广泛的底物范围、出色的区域选择性和克级合成是该反应的关键特征。还研究了三氟甲基化产物的进一步修饰。对照实验表明三氟甲基化过程可能涉及CF 3 -自由基机制。
An efficient NCS-promoted thiocyanation of pyrrolo[1,2-a]quinoxalines with NH4SCN or KSCN is described. A series of diverse 1-thiocyanatopyrrolo[1,2-a]quinoxalines were obtained in good yields with excellent functional group tolerance. With a similar strategy, the selenocyanation of pyrrolo[1,2-a]quinoxalines with KSeCN is also achieved. Importantly, this approach features mild reaction conditions
描述了一种有效的 NCS 促进的吡咯并[1,2- a ]喹喔啉与 NH 4 SCN 或 KSCN 的硫氰化。以良好的收率获得了一系列不同的 1-硫氰酸根吡咯并[1,2- a ]喹喔啉,具有优异的官能团耐受性。通过类似的策略,也实现了吡咯并[1,2- a ]喹喔啉与 KSeCN 的硒氰化反应。重要的是,这种方法具有温和的反应条件、广泛的底物范围和克级合成。此外,还进一步检查了产品的转变。
Copper-promoted C1−H amination of pyrrolo[1,2-a]quinoxaline with N‑fluorobenzenesulfonimide
作者:Di Hao、Zhen Yang、Yali Liu、Yang Li、Yan Liu、Ping Liu
DOI:10.1016/j.molstruc.2022.133636
日期:2022.11
A copper-promoted direct C1-amination of pyrrolo[1,2-a]quinoxalines with N-fluorobenzenesulfonimide (NFSI) has been achieved. A series of C1-aminated pyrrolo[1,2-a]quinoxalines were obtained with broad substrate scope and good functional group tolerance. Gram-scale synthesis and further derivation of this aminated product were also investigated. Mechanism studies suggest that this reaction probably
已经实现了铜促进的吡咯并[1,2- a ]喹喔啉与N-氟苯磺酰亚胺 (NFSI)的直接 C1 胺化。得到了一系列底物范围广、官能团耐受性好的C1-胺化吡咯并[1,2- a ]喹喔啉。还研究了该胺化产物的革兰氏规模合成和进一步衍生。机理研究表明,这种反应可能经历了一个自由基过程。