Synthetic Studies on Indoles and Related Compounds. XXXIII. Reaction of Ethyl Acylindole-2-carboxylates with Thallium Trinitrate.
作者:Masanobu TANI、Shigenobu MATSUMOTO、Yoshiyuki AIDA、Shiho ARIKAWA、Atsuko NAKANE、Yuusaku YOKOYAMA、Yasuoki MURAKAMI
DOI:10.1248/cpb.42.443
日期:——
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。