Enolizable ketones react with m-nitroaniline in the presence of strong base such as t-BuOK to give 4- and 6-substituted nitroindoles. The reaction proceeds via oxidative nucleophilic substitution of hydrogen in m-nitroaniline with enolate anions in positions ortho to the amino group giving anionic σH adducts that are additionally stabilized by intramolecular interaction between the amino and the carbonyl
Provided are pyrimidine compounds for inhibiting of Syk kinase, intermediates used in making such compounds, methods for their preparation, pharmaceutical compositions thereof, methods for inhibition Syk kinase activity, and methods for treating conditions mediated at least in part by Syk kinase activity.
A novel method of indole ring system construction: One-pot synthesis of 4- and 6- nitroindole derivatives via base promoted reaction between 3-nitroaniline and ketones
作者:Nikolai Moskalev、Mieczysław Makosza
DOI:10.1016/s0040-4039(99)01014-x
日期:1999.7
Base promoted condensation of ketones RCQCH(2)R' with 3-nitroaniline results in formation of the corresponding 4- and 6-nitro-2-R-3-R'-indoles. This multistep process apparently includes oxidative nucleophilic substitution of hydrogen in the aromatic ring of the aniline by the enolate anion and subsequent cyclization of the so formed ortho-aminoketone intermediate to indoles via a Baeyer type reaction. (C) 1999 Elsevier Science Ltd. All rights reserved.