Ionic liquid-promoted [3+2]-cycloaddition reactions of nitroformonitrile oxide generated by the cycloreversion of dinitrofuroxan
作者:Leonid L. Fershtat、Igor V. Ovchinnikov、Nina N. Makhova
DOI:10.1016/j.tetlet.2014.02.112
日期:2014.4
synthesis of 3-nitroisoxazoles and 3-nitroisoxazolines based on the [3+2]-cycloaddition of nitroformonitrile oxide (NFNO), generated by the cycloreversion of dinitrofuroxan (DNFO), to acetylene and ethylene derivatives, under ionic liquid catalysis is developed. The approach is of a general nature and applicable to cycloaddition reactions with other dipolarophiles.
Dinitrofuroxan cycloreversion as a novel general approach for the synthesis of nitroazoles
作者:L. L. Fershtat、D. V. Khakimov、N. N. Makhova
DOI:10.1007/s11172-015-0878-6
日期:2015.2
A novel general approach towards various nitroazoles via tandem process involving dinitrofuroxan cycloreversion followed by [3+2] cycloaddition of generated in situ nitroformonitrile oxide is developed. The reaction is promoted by addition of catalytic amounts of ionic liquids. Plausible mechanisms of the described processes based on quantum chemical calculations are proposed.