It is shown that 2-chloro-3H-indol-3-one 1 and analogues have never actually been isolated and that their reactions, reported over 115 years in 40 papers and 4 patents, are those of more or less impure 2-(2,2-dichloro-2,3-dihydro-3-oxoindol-1-yl)-3H-indol-3-one 14. Several reactions of the parent compound and its 5,5′-dimethyl and 5,5′-dibromo derivatives are reported, especially a reaction with dry methanol leading to the known indoloquinazoline 25 (‘methylisatoid’) and to the known alkaloid tryptanthrin 21 via a photolabile orthoester.
研究表明,
2-氯-3H-吲哚-3-酮 1 及其类似物实际上从未分离出来,115 年来发表在 40 篇论文和 4 项专利中的反应是那些或多或少不纯的 2-(2,2-二
氯-2,3-二氢-3-氧代
吲哚-1-基)-
3H-吲哚-3-酮 14 的反应。据报道,该母体化合物及其 5,5′-二甲基和 5,5′-二
溴衍
生物发生了多种反应,特别是与干
甲醇的反应导致生成了已知的
吲哚喹唑啉 25("甲基异类
固醇"),并通过可光化的原酯生成了已知的
生物碱色黄素 21。