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王磊磊0811至尊木虫 (著名写手)
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[求助]
求一篇论文中的几句话翻译
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最近看关于钯催化氧化的文献，有几句话需要专业点翻译，请教各位虫友帮助 An efficient Pd(II)-catalyzed difunctionalization reaction of internal alkynes is reported. In this reaction, various enynoates and electron-deficient alkenes were used for the syntheses of useful highly substituted pyrone derivatives via a 6-endo cyclization and subsequent alkenylation pathway. First, a 6-endo cyclization of the enynoate will occur which was activated by the alkyne Pd(II) ion. Therefore, an active vinylpalladium species B will be generated to react with methyl acrylate and afford the intermediate C via migratory insertion. The desired product 3a could be formed after reductive elimination and followed by the reoxidation of Pd(0) species into the next catalytic cycle by benzoquinone (BQ). |
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2楼2016-01-18 10:55:09