作者:F.Marinone Albini、P. Ceva、A. Mascherpa、E. Albini、P. Caramella
DOI:10.1016/0040-4020(82)80071-9
日期:1982.1
regioselective cycloaddition to benzonitrile oxide. In the reaction with the less reactive mesitonitrile oxide the sulfur dioxide deriving from the dimerization of the dipolarophile causes a catalytic decomposition of the nitrile oxide, which competes with the cycloaddition. Benzothiophene-1,1-dioxide and the vinyl sulfone system of 2,3-dihydrothiophene-1,1-dioxide and nitrile oxides with lower regioselectivity
噻吩-1,1-二氧化物经过区域选择性环加成反应生成苯甲腈氧化物。在与反应性较低的均三腈氧化物的反应中,源自双亲亲二聚体的二氧化硫引起腈氧化物的催化分解,该腈氧化物与环加成竞争。苯并噻吩-1,1-二氧化物和2,3-二氢噻吩-1,1-二氧化物和丁腈的乙烯基砜体系具有较低的区域选择性。借助于CNDO / 2计算已经阐明了磺酰基的指导作用。