描述了在室温可见光条件下利用有氧氧作为绿色氧化剂的离子液体催化的喹喔啉-2(1H)-酮氧化反应。各种N -1 -烷基和芳基取代的喹喔啉-2(1 H )-酮提供了良好收率的所需产物。所用的离子液体四甲基氢氧化铵(TMAH)很容易获得,并且在无添加剂和无碱条件下促进氧化。本程序说明了克级反应的适用性,并展示了目标产物随后转化为糖原磷酸化酶抑制剂。
Copper-Catalyzed Cascade Syntheses of 2H-benzo[b][1,4]thiazin-3(4H)-ones and Quinoxalin-2(1H)-ones through Capturing S and N Atom Respectively from AcSH and TsNH2
摘要:
A copper-catalyzed cascade method has been developed to synthesize the 2H-benzo[b][1,4]thiazin-3(4H)-ones from 2-halo-N-(2-halophenyl)-acetamides 1 and AcSH via the S(N)2/deacetylation/coupling process, and to synthesize the quinoxalin-2(1H)-ones from 1 and TsNH2 via the S(N)2/coupling/desulfonation process. The target products were obtained with diversity at three positions on their scaffolds.
Direct <i>para</i>-C–H heteroarylation of anilines with quinoxalinones by metal-free cross-dehydrogenative coupling under an aerobic atmosphere
作者:Jun Xu、Lin Huang、Lei He、Chenfeng Liang、Yani Ouyang、Jiabin Shen、Min Jiang、Wanmei Li
DOI:10.1039/d1gc01899j
日期:——
Herein, a green and efficient metal-free cross-dehydrogenative coupling (CDC) for the direct para-C–H heteroarylation of anilines with quinoxalinones has been described. This reaction is performed in H2O/DMSO (v/v = 2 : 1) usingair as the soleoxidant. Various anilines (primary, secondary and tertiary amines) and quinoxalinones are well compatible, affording the corresponding products in moderate-to-good
本文描述了一种绿色且高效的无金属交叉脱氢偶联(CDC),用于苯胺与喹喔啉酮的直接对-C-H 杂芳基化。该反应在 H 2 O/DMSO (v/v = 2:1) 中进行,使用空气作为唯一氧化剂。各种苯胺(伯胺、仲胺和叔胺)和喹喔啉酮具有良好的相容性,以中等至良好的产率提供相应的产品。这种方法为含氮化合物的后期改性提供了一种环境友好且有效的替代方法。
Transition-metal free C3-amidation of quinoxalin-2(1<i>H</i>)-ones using Selectfluor as a mild oxidant
efficient synthetic route to construct a variety of 3-amidated quinoxalin-2(1H)-ones was developed via transition-metal free direct oxidative amidation of quinoxalin-2(1H)-ones with amidates usingSelectfluor reagent as a mild oxidant. This protocol features mild reaction conditions, operational simplicity, broad substrate scope, and good to excellent yields.
一种实用的和有效的合成路线来构造各种3-酰胺化喹喔啉-2(1 H ^ -酮)的开发是通过喹喔啉-2-的过渡金属无直接氧化酰胺化(1 ħ) -酮使用的Selectfluor试剂作为酰胺化温和的氧化剂。该方案的特点是反应条件温和,操作简便,底物范围广,收率高至优异。
BI-OAc-Accelerated C3–H Alkylation of Quinoxalin-2(1<i>H</i>)-ones under Visible-Light Irradiation
作者:Xiang-Kui He、Juan Lu、Ai-Jun Zhang、Qing-Qing Zhang、Guo-Yong Xu、Jun Xuan
DOI:10.1021/acs.orglett.0c02080
日期:2020.8.7
photoredox-catalyst-free radical alkylation of quinoxalin-2(1H)-ones has been described. This reaction utilizes 4-alkyl-1,4-dihydropyridines (R-DHPs) as alkyl radicalprecursors and acetoxybenziodoxole (BI-OAc) as an electron acceptor to undergo single-electron transfer with photoexcited R-DHPs. The benign conditions allow for good compatibility in the scope of both quinoxalin-2(1H)-ones and R-DHPs. The
Electrochemical decarboxylative C3 alkylation of quinoxalin-2(1<i>H</i>)-ones with <i>N</i>-hydroxyphthalimide esters
作者:Kaikai Niu、Lingyun Song、Yanke Hao、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d0cc05391k
日期:——
We have developed a protocol for electrochemical decarboxylative C3 alkylation of a wide range of quinoxalin-2(1H)-ones under metal- and additive-free conditions. N-Hydroxyphthalimide esters derived from chain, cyclic, primary, secondary, and tertiary carboxylic acids with a broad scope proved to be suitable substrates. This operationally simple protocol performed in an undivided cell under constant-current