Mn(III)-catalyzed aerobic oxidation of 2-alkenyl-1,3-diketone enols. Synthesis of 1,2-dioxin-3-ols and natural phytohormone G factors
作者:Sousuke Oka、Shintaro Hashimoto、Kazuki Hisano、Hiroshi Nishino
DOI:10.1016/j.tet.2022.132631
日期:2022.1
is described. The reaction produced unsaturated endoperoxides, i.e., 1,2-dioxin-3-ols, via resonance stabilized alkenyldiketone radicals. This convenient and eco-friendly reaction was applied to the synthesis of natural phytohormone G3 and its analogs. The obtained 1,2-dioxin-3-ol was easily transformed in several alcohols into the corresponding acetals. In addition, the mechanism for the Mn(III)/Mn(II)
描述了 Mn(III) 催化的 2-alkenyl-1,3-diketone enols 的有氧氧化。该反应通过共振稳定的烯基二酮自由基产生不饱和内过氧化物,即1,2-二恶英-3-醇。这种方便、环保的反应被应用于天然植物激素G3及其类似物的合成。得到的 1,2-dioxin-3-ol 很容易在几种醇中转化为相应的缩醛。此外,还简要讨论了空气中Mn(III)/Mn(II)催化循环的机理以及保留过氧键的缩醛的形成。