Thermal Rearrangement of 3-Hydroxy-1H,3H-quinoline-2,4-diones to 3-Acyloxy-2,3-dihydro-1H-indol-2-ones
摘要:
3-Alkyl/aryl-3-hydroxy-1H,3H-quinoline-2,4-diones (2) were transformed into isomeric 3-acyloxy-2,3-dihydro-1H-indol-2-ones (3) by thermally induced molecular rearrangement. All products were characterized by their H-1 NMR, C-13 NMR, and IR spectra.
Thermal Rearrangement of 3-Hydroxy-1H,3H-quinoline-2,4-diones to 3-Acyloxy-2,3-dihydro-1H-indol-2-ones
摘要:
3-Alkyl/aryl-3-hydroxy-1H,3H-quinoline-2,4-diones (2) were transformed into isomeric 3-acyloxy-2,3-dihydro-1H-indol-2-ones (3) by thermally induced molecular rearrangement. All products were characterized by their H-1 NMR, C-13 NMR, and IR spectra.
Novel Ring Contraction of 3-Hydroxy-2,4(1<i>H</i>,3<i>H</i>)-quinolinediones in Aqueous Alkali. The First Convenient Route to 2-Hydroxyindoxyls
作者:Stanislav Kafka、Antonín Klásek、Janez Košmrlj
DOI:10.1021/jo015786d
日期:2001.9.1
Ring contraction of 3-hydroxy-2,4(1H,3H)-quinolinediones (1) in aqueous potassium hydroxide resulted in the formation of 2-hydroxyindoxyls and/or dioxindoles. The choice of N-substituent and the reaction conditions govern the chemoselectivity of the reaction. N-Phenyl-substituted derivatives 1 give 2-hydroxyindoxyls, while N-alkyl- and N-benzyl-substituted derivatives afford the corresponding dioxindols. On the basis of byproduct analysis, as well as independent experiments, the most plausible reaction mechanism is proposed.
Thermal Rearrangement of 3-Hydroxy-1H,3H-quinoline-2,4-diones to 3-Acyloxy-2,3-dihydro-1H-indol-2-ones
3-Alkyl/aryl-3-hydroxy-1H,3H-quinoline-2,4-diones (2) were transformed into isomeric 3-acyloxy-2,3-dihydro-1H-indol-2-ones (3) by thermally induced molecular rearrangement. All products were characterized by their H-1 NMR, C-13 NMR, and IR spectra.