Visible‐Light‐Induced Direct C−H Amination of Quinoxalin‐2(1
H
)‐ones
摘要:
AbstractA visible‐light‐induced direct C(sp2)−H amination of quinoxalin‐2(1H)‐ones toward the synthesis of substituted 3‐aminoquinoxalin‐2(1H)‐ones with TMSN3 has been firstly developed. This transformation achieved C(sp2)−H/N−H coupling in the absence of external ligand and oxidant. Notably, this methodology features mild reaction conditions, broad substrate scope and operational simplicity.magnified image
<i>O</i>-Perhalopyridin-4-yl Hydroxylamines: Amidyl-Radical Generation Scaffolds in Photoinduced Direct Amination of Heterocycles
作者:Lan Zheng、Yu-En Qian、Yuan-Zhuo Hu、Jun-An Xiao、Zhi-Peng Ye、Kai Chen、Hao-Yue Xiang、Xiao-Qing Chen、Hua Yang
DOI:10.1021/acs.orglett.1c00064
日期:2021.3.5
O-perhalopyridin-4-yl hydroxylamines as shelf-stable and versatile amidyl-radical precursors. The novel amination reagents can be easily prepared via a single synthetic step from inexpensive commercially available starting materials using monoprotected HONH2 as amino source. The synthetic potency of the developed reagents was well demonstrated by direct amination of a series of quinoxalin-2(1H)-ones and their
A practical and efficient route for copper-catalyzed C-3 amination of quinoxalin-2(1H)-ones with easily available azoles as nitrogen sources and Selectfluor as mild oxidant has been developed. The transformation features atomic economy, simple operation, broad substrate scope, and moderate to excellent yields.
已经开发了一种实用且有效的铜催化 C-3 胺化喹喔啉-2(1 H )-酮的路线,以容易获得的唑类作为氮源,Selectfluor 作为温和的氧化剂。该转化具有原子经济、操作简单、底物范围广、收率中等至优等特点。
Synthesis of [1,2,3]Triazolo-[1,5-<i>a</i>]quinoxalin-4(5<i>H</i>)-ones through Photoredox-Catalyzed [3 + 2] Cyclization Reactions with Hypervalent Iodine(III) Reagents
作者:Jinxia Wen、Wenyan Zhao、Xu Gao、Xiaofang Ren、Chunping Dong、Cheli Wang、Li Liu、Jian Li
DOI:10.1021/acs.joc.2c00135
日期:2022.3.18
variety of [1,2,3]triazolo-[1,5-a]quinoxalin-4(5H)-ones via a [3 + 2] cyclization reaction by photoredox catalysis between quinoxalinones and hypervalent iodine(III) reagents is reported. A range of quinoxalinones and hypervalent iodine(III) reagents were tolerated well. This cyclization reaction allows access to structurally diverse [1,2,3]triazolo-[1,5-a]quinoxalin-4(5H)-ones in moderate to good yields
通过喹喔啉酮和高价碘之间的光氧化还原催化 [3 + 2] 环化反应高效合成多种 [1,2,3] 三唑-[1,5- a ]quinoxalin-4(5 H )-ones( III) 报告试剂。一系列喹喔啉酮和高价碘 (III) 试剂耐受性良好。这种环化反应允许以中等至良好的产率获得结构多样的 [1,2,3]三唑-[1,5- a ]喹喔啉-4(5 H )-酮。
Copper-Catalyzed Oxidative [3 + 2]-Annulation of Quinoxalin-2(1<i>H</i>)-one with Oxime Esters toward Functionalized Pyrazolo[1,5-<i>a</i>]quinoxalin-4(5<i>H</i>)-ones as Opioid Receptor Modulators
Pyrazolo[1,5-a]quinoxalin-4(5H)-one derivatives as novel opioid receptor modulators have been synthesized via copper-catalyzed oxidative [3 + 2]-annulation of quinoxalin-2(1H)-one and oxime-O-acetates. This hydrazine-free C–C and N–N bond formation strategy starts with the generation of C2N1 synthon using oxime acetate, which reacts in a [3 + 2] manner with quinoxalin-2(1H)-one, followed by oxidative
Pyrazolo[1,5 - a ]quinoxalin-4( 5H )-one 衍生物作为新型阿片受体调节剂已通过铜催化氧化 [3 + 2]-quinoxalin-2( 1H )-one 和肟的环化合成- O-乙酸盐。这种不含肼的 C-C 和 N-N 键形成策略始于使用乙酸肟生成 C 2 N 1合成子,其以 [3 + 2] 方式与 quinoxalin-2(1 H )-one 反应,随后通过氧化芳构化。合成的化合物针对阿片受体进行了测试,其中八种化合物与 EC 50具有拮抗作用< 5 μM 在各种阿片受体上。进行分子对接研究以确定活性 pyrazolo[1,5 - a ]quinoxalin-4(5 H )-one 配体与 hKOR 蛋白的结合。对接结果表明化合物3d和3g与活性位点口袋残基T111的羟基参与氢键结合。
Copper-catalyzed C-3 benzylation of quinoxalin-2(1<i>H</i>)-ones with benzylsulfonyl hydrazides
benzylsulfonyl hydrazides as benzylating agents has been demonstrated in the directC-3benzylation of quinoxalin-2(1H)-ones. A range of benzylsulfonyl hydrazides participated in the C-3benzylation of quinoxalin-2(1H)-ones with CuCN as the catalyst and DTBP as the oxidant, delivering structurally diverse 3-benzylquinoxalin-2(1H)-ones in moderate to good yields.