Visible-light induced decarboxylative alkylation of quinoxalin-2(1<i>H</i>)-ones at the C3-position
作者:Wenxuan Xue、Yingpeng Su、Ke-Hu Wang、Rong Zhang、Yawei Feng、Lindan Cao、Dangfeng Huang、Yulai Hu
DOI:10.1039/c9ob01169b
日期:——
simple and efficient method for the visible light induced direct carbon alkylation of quinoxalin-2(1H)-ones at the C3 position is described. This protocol employs cheap and readily available phenyliodine(III) dicarboxylates as the alkylation reagents to conduct decarboxylative radical coupling reaction with quinoxalin-2(1H)-ones. The process exhibits excellent compatibility to functional groups and
Visible-light induced C3-H trifluoromethylation of quinoxalin-2(1H)-ones with CF3SO2Cl under external photocatalyst-free conditions
作者:Xia Mi、Beibei Cui、Jingyu Zhang、Chao Pi、Xiuling Cui
DOI:10.1016/j.tetlet.2022.153693
日期:2022.3
light-induced C-H trifluoromethylation of quinoxalin-2(1H)-ones with CF3SO2Cl as CF3 radical source under photocatalyst-free conditions. The reaction proceeds smoothly through a radical process in the absence of photocatalyst and oxidant in moderate to good yields, thus offering an efficient and green method for the synthesis of 3-trifluoromethyl quinoxalin-2(1H)-ones.
本文报道了在无光催化剂条件下,以 CF 3 SO 2 Cl 作为 CF 3自由基源的 quinoxalin-2(1 H )-ones的可见光诱导 CH 三氟甲基化。该反应在没有光催化剂和氧化剂的情况下以中等至良好的收率通过自由基过程顺利进行,从而为合成3-三氟甲基喹喔啉-2( 1H )-酮提供了一种高效、绿色的方法。
Divergent C(sp<sup>2</sup>)–H arylation of heterocycles <i>via</i> organic photoredox catalysis
作者:Jie Ren、Chao Pi、Xiuling Cui、Yangjie Wu
DOI:10.1039/d1gc04825b
日期:——
key step in the syntheses of natural products, drugs, and functional materials. Herein, we describe an unprecedented photocatalytic direct C(sp2)–H arylation of heterocycles. Notably, hypervalent iodine(III) ylides (HVIs) were firstly employed as a general arylating reagent under mild and easily handled reaction conditions, in which aryl radicals were afforded from the HVIs through single electron transfer
<i>N</i>-Chlorosulfonyl carbamate-enabled, photoinduced amidation of quinoxalin-2(1<i>H</i>)-ones
作者:Chu-Ping Yuan、Zhen-Zhen Xie、Yu Zheng、Jun-Tao He、Jian-Ping Guan、Hong-Bin Chen、Hao-Yue Xiang、Kai Chen、Hua Yang
DOI:10.1039/d3cc02744a
日期:——
available N-chlorosulfonyl carbamate as an effective amidyl-radical precursor, which could be readily prepared from commercial low-cost chlorosulfonyl isocyanate (CSI) and alcohol feedstocks. The synthetic potency of this developed protocol was well demonstrated by direct amidation of various quinoxalin-2(1H)-ones. The protocol could be further streamlined by implementing a one-pot/two-step/three-component
本文报道了一种新的光诱导酰胺化方案的设计和开发,该方案使用容易获得的N-氯磺酰氨基甲酸酯作为有效的酰胺自由基前体,该前体可以很容易地由商业低成本氯磺酰异氰酸酯(CSI)和醇原料制备。该开发方案的合成效力通过各种喹喔啉-2(1 H )-酮的直接酰胺化得到了很好的证明。通过实施CSI、酒精和喹喔啉-2(1 H )-一的一锅/两步/三组分工艺,可以进一步简化该方案,并显着提高反应效率。该方法为快速扩展含氮分子复杂性提供了一个有趣的机会,从而激发了对CSI试剂新反应模式的全面探索。
salts to construct an EDA complex, providing a catalyst-free and mild protocol to obtain 1-trifluoromethyl-3-quinoxaline derivativesbicyclo[1.1.1]pentanes in high yields under photo-induced condition (36 examples), with structural modifications to the bioactive molecule derivatives also successfully implemented.