Heterocyclic Iodoniums for the Assembly of Oxygen-Bridged Polycyclic Heteroarenes with Water as the Oxygen Source
摘要:
A diverse set of novel heterocyclic iodoniums was synthesized for the first time. The reactions of these unique iodoniums with environmentally benign water as the oxygen source provided structurally complex oxygen-incorporated heteropolycycles that are essential motifs in natural products and biologically active compounds. The transformation only required low-cost copper acetate. Further derivatization of the obtained polycycles expanded the structural diversity, which is important in the building of chemical libraries for drug discovery.
formation of functionalized isoxazoles and chromones, respectively. Alkoxy(aryl)methyl group containing compounds were obtained in good and high yields. An oxocarbenium ion mediated cyclization of (Z)-1,3-diarylprop-2-yn-1-one O-methyloximes and 3-arylprop-2-yn-1-(2-methoxyphenyl)-1-ones resulted in regioselective formation of functionalized isoxazoles and chromones, respectively. Alkoxy(aryl)methyl group
The synthesis of 3-sulfenylflavones via FeCl3-promoted regioselective cyclization of alkynyl aryl ketones with N-arylthiobenzamides
作者:Lin-Feng Shi、Xing-Guo Zhang、Xiao-Hong Zhang
DOI:10.1016/j.tet.2016.11.034
日期:2016.12
A FeCl3-promoted regioselectivecyclization of alkynyl aryl ketones with N-arylthiobenzamides had been developed for the synthesis of 3-sulfenylflavones derivatives. Various alkynyl aryl ketones and N-arylthiobenzamides with a number of functional groups were compatible in this reaction to afford the corresponding 3-sulfenylflavones in moderate to good yields. The mechanism was described in detail
Iron(III) Chloride/Diorganyl Diselenides-Promoted Regioselective Cyclization of Alkynyl Aryl Ketones: Synthesis of 3-Organoselenyl Chromenones under Ambient Atmosphere
作者:Benhur Godoi、Adriane Sperança、Cesar A. Bruning、Davi F. Back、Paulo Henrique Menezes、Cristina W. Nogueira、Gilson Zeni
DOI:10.1002/adsc.201100189
日期:2011.8
benign synthesis of 3-organoselenylchromenones was accomplished via iron(III) chloride/diorganyldiselenides-promoted intramolecular 6-endo-dig cyclization of alkynylarylketone derivatives. The cyclization reactions proceeded cleanly under mild reaction conditions, and the desired chromenone derivatives were smoothly isolated in good yields. The methodology proved to be highly regioselective, giving
three-component reaction of alkynylaryl ketones bearing an ortho-methoxy group, element selenium, and arylboronic acid, providing a facile route to selenofunctionalized chromone products has been developed. This protocol features high efficiency and high regioselectivity, and the use of selenium powder as the selenium source. Mechanistic experiments indicated that the combined oxidative effect of (bis(tri