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-dioxide intermediates.
使3-二乙氨基-4-(4-甲氧基苯基)-5-乙烯基-异噻唑1,1-二氧化物与氧化腈和慕尼黑酯反应,以高收率得到环加合物。环加成反应仅在乙烯基上发生。环加合物通过异恶唑-或吡咯-异噻唑啉1,1-二氧化物中间体热解转变为α,β-不饱和腈。