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
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
DTBP-promoted decarbonylative alkylation of quinoxaline-2(1H)-ones with aldehydes
作者:Bingqing Wang、Hua Yao、Xiaoyang Zhong、Zhaohua Yan、Sen Lin
DOI:10.1016/j.tetlet.2020.152720
日期:2021.2
An efficient DTBP-promoted directalkylation of quinoxaline-2(1H)-ones with aldehydes has been developed under metal-free conditions. The reaction undergoes sequential decarbonylation and radical addition using aliphatic aldehyde as a cheap and abundant alkyl radical source. A convenient and efficient approach for the synthesis of various 3-alkylquinoxaline-2(1H)-ones was provided.
alkenes with up to 99% yield and 99% enantiomeric excess (ee). The mechanism of chiral regenerable NAD(P)Hmodels was investigated as well. Isotope-labeling reactions indicated that chiral NAD(P)Hmodels were regenerated by the ruthenium complex under hydrogen gas first, and then the hydride of NAD(P)Hmodels was transferred to unsaturated bonds in the presence of transfer catalysts. In addition, density
The visible-light-triggered regioselective alkylation of quinoxalin-2(1<i>H</i>)-ones <i>via</i> decarboxylation coupling
作者:Hongdou Zhang、Jun Xu、Min Zhou、Jianming Zhao、Pengfei Zhang、Wanmei Li
DOI:10.1039/c9ob02203a
日期:——
An efficient protocol to synthesize 3-alkylated quinoxalin-2(1H)-ones through photocatalytic decarboxylation coupling reactions of quinoxalin-2(1H)-ones with N-hydroxyphthalimide ester was developed.