Synthesis of 1,3-dioxin-4-ones and their use in synthesis. Part XXII. A novel synthetic method for tetronic acids from 1,3-dioxin-4-ones via intra- or intermolecular ketene trapping.
作者:Masayuki SATO、Jun-ichi SAKAKI、Kazuhisa TAKAYAMA、Satoshi KOBAYASHI、Miwako SUZUKI、Chikara KANEKO
DOI:10.1248/cpb.38.94
日期:——
Novel synthetic routes to tetronic acid and its derivatives from 6-substituted 1, 3-dioxin-4-ones through cycloreversion to acylketenes followed by either intra- or intermolecular ketene trapping by a hydroxy function is described. While tetronic acid and its 5-substituted derivatives were synthesized directly from 6-(x-hydroxyalky)-1, 3-dioxin-4-ones by intramolecular trapping, 3-acyltetronic acids were prepared by Dieckmann reaction of the β-keto esters obtained from the 6-substituted dioxinones and an approptiate α-hydroxy ester by intermolecdular trapping.
本文介绍了从 6-取代的 1,3-二恶英-4-酮通过环己基转化为酰基烯烃,然后通过羟基功能进行分子内或分子间酮阱合成四烯酸及其衍生物的新合成路线。四烯酸及其 5-取代衍生物是通过分子内捕集法从 6-(x-羟基烷基)-1, 3-二恶英-4-酮直接合成的,而 3-酰基四烯酸则是通过分子间捕集法使从 6-取代的二恶英酮中获得的 β-酮酯和适当的 α-羟基酯发生迪克曼反应而制备的。