A general and efficient oxyhalogenation of unsaturated ketoximes has been achieved through copper catalysis with diethyl bromomalonate, N-chlorosuccinimide, and N-iodosuccinimide, yielding 5-chloromethyl, 5-bromomethyl, and 5-iodomethyl isoxazolines in good to excellent yields.
CuBr 2 -promoted intramolecular bromocyclization of N-allylamides and aryl allyl ketone oximes
作者:Chun-Hua Yang、Zhong-Qi Xu、Lili Duan、Yue-Ming Li
DOI:10.1016/j.tet.2017.10.025
日期:2017.11
A new and easy-to-perform route to 2-oxazolines amd isoxazolines was reported. Using CuBr2 as both the bromide source and the reaction promoter, bromocyclization of N-allylamides and allyl ketone oximes proceeded readily, leading to oxazolines and isoxazolines in good to excellent yields.
A new electrochemical method for the synthesis of 2-isoxazolines is reported. The reaction operates under atmospheric conditions and tolerates air and moisture. The use of potassium bromide as both electrolyte and bromine source precludes the need for toxic, air-sensitive inorganic oxidants or transition metal catalysts.
作者:Michael D. Mosher、Amber L. Norman、Khriesto A. Shurrush
DOI:10.1016/j.tetlet.2009.07.106
日期:2009.10
The preparation of substituted 4,5-dihydroisoxazoles can be accomplished via the treatment of beta,gamma-unsaturatecl oximes with liquid bromine. The reaction provides a convenient route to the highly functionalized title compounds. (C) 2009 Elsevier Ltd. All rights reserved.