Ethyl acylindole-2-carboxylates were treated with thallium trinitrate (TTN) in methanol, methyl orthoformate, methyl orthoformate/sulfuric acid, and acetic acid. The reactions in the former three methanolic solvents gave methyl indoleacetate derivatives via the Favorskii-type rearrangement reaction at the acyl group, whereas the reaction in acetic acid gave oxindole derivative with rearrangement of the C2-ethoxycarbonyl group. The TTN reaction was applied to a model compound leading to the synthesis of lysergic acid.
酰基
吲哚-2-羧酸乙酯在
甲醇、原
甲酸甲酯、原
甲酸甲酯/
硫酸和
乙酸中与三
硝酸铊(
TTN)反应。在前三种
甲醇溶剂中的反应是通过酰基上的 Favorski 型重排反应生成
吲哚乙酸甲酯衍
生物,而在
乙酸中的反应是通过 C2-乙氧羰基的重排反应生成
吲哚衍
生物。
TTN 反应被应用于一种模型化合物,导致
麦角酸的合成。