Metal-Free Oxidative C(sp<sup>3</sup>)–H Bond Functionalization of Alkanes and Conjugate Addition to Chromones
作者:Jincan Zhao、Hong Fang、Ping Qian、Jianlin Han、Yi Pan
DOI:10.1021/ol502524d
日期:2014.10.17
A metal-free oxidative C(sp3)–H bond functionalization and subsequent conjugate addition reaction using di-tert-butyl peroxide (DTBP) as the oxidant was established, which tolerates a wide range of simple alkane substrates to react with different substituted chromones for direct preparation of 2-alkylchromanones.
New Entries to 3-Acylchromones: TM-Catalysed Decarboxylative Cross-Coupling of α-Keto Acids with <i>ortho</i>
-Hydroxyarylenaminones, 2,3-Unsubstituted Chromones and 3-Iodochromones
作者:Satenik Mkrtchyan、Viktor O. Iaroshenko
DOI:10.1002/ejoc.201801231
日期:2018.12.31
Three new entries to 3‐acylchromones utilizing transition metal catalyzed decarboxylative cross‐coupling reactions of α‐keto acids with ortho‐hydroxyenaminones, 2,3‐unsubstituted chromones and 3‐iodochromones are reported. The title methodologies permit a concise synthesis of series of drug‐like chromone derivatives and are suitable for the combinatorial preparation of compounds libraries.
DTBP-promoted site-selective α-alkoxyl C–H functionalization of alkyl esters: synthesis of 2-alkyl ester substituted chromanones
作者:Jin-Tao Yu、Yiting Li、Rongzhen Chen、Zixian Yang、Changduo Pan
DOI:10.1039/d1ob00605c
日期:——
The direct C–H functionalization of ethylacetates was developed, delivering a variety of 1-(4-oxochroman-2-yl)ethylacetate derivatives by reacting with chromones. This reaction has a wide substrate scope with excellent site-selective C–H activation at the inactive α-hydrogen of the alkoxyl group instead of the α-hydrogen of the carbonyl group under radical conditions. Compared with other protocols
Regioselective Cross-Couplings of Coumarins and Flavones with Ethers via C(sp<sup>3</sup>)–H Functionalization
作者:Ben Niu、Wannian Zhao、Yingcai Ding、Zhaogang Bian、Charles U. Pittman、Aihua Zhou、Haibo Ge
DOI:10.1021/acs.joc.5b00800
日期:2015.7.17
Coumarin and flavone derivatives are highly valuable molecules in drug discovery. Here, two new regioselective cross-dehydrogenation couplings of coumarins and flavones with different ethers via C(sp3)–H functionalization processes were developed, generating new ether-substituted derivatives not previously reported. These reactions proceeded well via radical mechanisms and provided the corresponding
Ammonium iodide-mediated regioselective chalcogenation of chromones with diaryl disulfides and diselenides
作者:Tao Guo
DOI:10.1080/00397911.2017.1364766
日期:2017.11.17
ABSTRACT A metal-free method for the synthesis of 3-chalcogenyl-chromones/quinolones from chromones/quinolones and diorganyl dichalcogenides using ammonium iodide under air was developed. This approach allowed the preparation of a wide range of 3-selenyl- and 3-sulfenyl-chromones/quinolones in good to excellent yields. GRAPHICAL ABSTRACT