Cycloaddition Reactions of Silyldiazoalkanes Involving Rearrangements from Carbon to Nitrogen
作者:A. R. Bassindale、A. G. Brook
DOI:10.1139/v74-517
日期:1974.10.15
The products obtained from the 1,3 cycloadditions of a variety of silyldiazoalkanes, R3SiCN2R′, to several alkenes were studied: the data are consistent with the initial formation of the expected Δ1-pyrazoline. However, when R′ = Ph, COOEt, but not Me, a thermal 1,3 rearrangement of the silyl group from carbon to nitrogen subsequently occurs. Base-catalyzed isomerizations of the Δ1 to Δ2-pyrazolines
研究了从各种甲硅烷基重氮烷烃 R3SiCN2R' 与几种烯烃的 1,3 环加成反应获得的产物:数据与预期的 Δ1-吡唑啉的初始形成一致。然而,当 R' = Ph、COOEt 而不是 Me 时,随后会发生甲硅烷基从碳到氮的热 1,3 重排。注意到了 Δ1 到 Δ2-吡唑啉的碱催化异构化,以及 Δ1-吡唑啉在回流甲醇中的脱甲硅烷基化。提出了各种反应的机制。