Condensation of p-tropoquinones and 5-hydroxytropolones, preferably by acid, yielded dicycloheptafurandione derivatives, which have the same carbon framework with utahin, a naturally-occurring dimeric tropolone. Partial oxidation of 5-hydroxytropolones and partial reduction of p-tropoquinones respectively yielded the condensates. This should exemplify the “phenol oxidation” in troponoids.
p-tropoquinones 和 5-hydroxytropolones 的缩合,优选通过酸,产生二环七
呋喃二酮衍
生物,其具有与 utahin 相同的碳骨架,utahin 是一种天然存在的二聚体
托酚酮。5-羟基托苯醌的部分氧化和对-原苯醌的部分还原分别产生缩合物。这应该是类
固醇中的“
苯酚氧化”的例证。