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