One-step method for synthesis of 2,4-disubstituted quinazoline 3-oxides by reaction of a 2-aminoaryl ketone with a hydroxamic acid using Zn(OTf)2 as the catalyst
A simple and efficient method for the preparation of 2,4-disubstituted quinazoline3-oxides by reaction of a hydroxamic acid with 2-aminoaryl ketones using zinc(II) triflate as the catalyst is described.
One-step synthesis of 4-methyl-2-substituted quinazoline-3-oxides via polyphosphoric acid catalyzed acylation of electron-rich anilides with nitroethane
作者:Igor Yu Grishin、Alexander V. Aksenov、Nicolai A. Aksenov、Yuriy I. Grishin、Alexander V. Leontiev、Dmitrii A. Aksenov
DOI:10.1016/j.tet.2023.133784
日期:2024.1
A diverse set of 4-methyl-2-substituted quinazoline-3-oxides has been prepared usingpolyphosphoricacid both as a reaction medium and a Brønsted-acid catalyst. The reaction proceeds in a domino fashion via the formation of a corresponding oxime followed by exo-trig cyclization and elimination of a water molecule which leads, ultimately, to the target N-oxide heterocycles.