1,3-Cycloaddition of Benzonitrile oxides to diazepines.II. 1-ethoxycarbonyl-4-methyl- and 6-methyl-1,2-diazepine
作者:Paolo Beltrame、Enzo Cadoni、Costantino Floris、Gioanna Gelli
DOI:10.1016/s0040-4020(01)87975-8
日期:1993.8
Stable arylnitrile oxides (1b-e) and 1-ethoxycarbonyl-4-methyl and 6-methyl-1,2-diazepines (2f and 2h) undergo 1,3-cycloaddition reactions to give 1,2,4-oxadiazole derivatives (3) as the most abundant products. Secondary products of the class of isoxazoles (5 or 8) and 4,5-dihydroisoxazoles (6 or 7) were also identified. Overall kinetics were measured at 70.0°C, in mixtures of 1,1,2,2-tetrachloroethane
稳定的芳基腈氧化物(1b-e)和1-乙氧基羰基-4-甲基和6-甲基-1,2-二氮杂(2f和2h)进行1,3-环加成反应,得到1,2,4-恶二唑衍生物(3)作为最丰富的产品。还鉴定了异恶唑类(5或8)和4,5-二氢异恶唑类(6或7)的次级产物。在1,1,2,2-四氯乙烷和DMF的混合物中,于70.0°C测量整体动力学。获得了平行反应的速率系数。讨论了取代基和溶剂的作用。