Synthesis of γ-Pyrones and <i>N</i>-Methyl-4-pyridones via the Au Nanoparticle-Catalyzed Cyclization of Skipped Diynones in the Presence of Water or Aqueous Methylamine
作者:Elisavet-Maria Zantioti-Chatzouda、Vasiliki Kotzabasaki、Manolis Stratakis
DOI:10.1021/acs.joc.2c00627
日期:2022.7.1
were not seen. The reaction does not proceed via the initial 1,3-transposition of the skipped diynones to their corresponding conjugated 1,3-diynone isomers. If aqueous methylamine is added, N-methyl-4-pyridones are exclusively formed in 69–79% yields via an analogous hydroamination/Au-catalyzed 6-endo cyclization pathway.
负载在 TiO 2上的 Au 纳米颗粒通过三键活化催化跳过的二炔酮在含水二恶烷中水合/6-内环化为 γ-吡喃酮。没有看到可以使用均相离子 Au(I) 催化剂通过竞争且通常占主导地位的 5-外环化途径形成的异构 3(2 H )-呋喃酮。该反应不会通过跳过的二炔酮的初始 1,3-转位为其相应的共轭 1,3-二炔酮异构体进行。如果加入甲胺水溶液,则通过类似的加氢胺化/Au 催化的 6-内环化途径仅以 69-79% 的产率形成N-甲基-4-吡啶酮。