Reactions of 1,3,5-triazinylnitroformaldoximes 5*. Synthesis of 5-R-3-(1,3,5-triazinyl)-4,5-dihydro-isoxazoles
作者:V. V. Bakharev、A. A. Gidaspov、E. V. Selezneva、O. S. El’tsov
DOI:10.1007/s10593-012-1076-1
日期:2012.9
1,3,5-Triazinylnitrile oxides, formed by heating (2-methoxy-4-R-1,3,5-triazin-6-yl)nitroformaldoximes, react with monosubstituted and 1,1-disubstituted ethylenes with the formation of 3-(1,3,5-triazinyl)-5-monosubstituted and 3-(1,3,5-triazinyl)-5,5-disubstituted 2-isoxazolines. The cycloaddition occurs with high regioselectivity to give exclusively 2-isoxazolines substituted at the positions 3 and 5.