Isothiazoles. Part VIII. Thermal rearrangement to α,β-unsaturated nitriles of cycloadducts from 3-diethylamino-4-(4-methoxyphenyl)-5-vinyl-isothiazole 1,1-dioxide with nitrile oxides and münchnones
作者:Francesca Clerici、Maria Luisa Gelmi、Raffaella Soave、Marinella Valle
DOI:10.1016/s0040-4020(98)00668-1
日期:1998.9
3-Diethylamino-4-(4-methoxyphenyl)-5-vinyl-isothiazole 1,1-dioxide was reacted with nitrile oxides and münchnones affording the cycloadducts in good yields. The cycloaddition reaction occurred at the vinyl group exclusively. The cycloadducts undergo pyrolytic transformation into α,β-unsaturated nitriles through the isoxazole-or pyrrole-isothiazoline 1,1-dioxideintermediates.