Reactions of Benzocyclopropene with Sulfonyl Isocyanates and Nitrones: Cycloadditions through C–C σ-Bond Rupture of Three-Membered Ring
作者:Shinzo Kagabu、Katsuhiro Saito、Hiroyuki Watanabe、Kensuke Takahashi、Katsuaki Wada
DOI:10.1246/bcsj.64.106
日期:1991.1
Alkane- and arenesulfonyl isocyanates were added to benzocyclopropene across the C–C σ-bond of the three-membered ring, giving 2-sulfonyl-1-isoindolinones. The reaction with C,N-diphenylnitrone afforded a similar cyclization product, 3,4-dihydro-3,4-diphenyl-1H-2,3-benzoxazine. These reactions are considered to proceed through zwitterionic intermediates formed by the fission of the C–C σ-bond of the
烷烃和芳烃磺酰基异氰酸酯通过三元环的 C-C σ 键添加到苯并环丙烯中,得到 2-磺酰基-1-异吲哚啉酮。与 C,N-二苯基硝酮反应得到类似的环化产物 3,4-二氢-3,4-二苯基-1H-2,3-苯并恶嗪。这些反应被认为是通过亲电子试剂裂变三元环的 C-C σ 键形成的两性离子中间体进行的。