Beitr�ge zur Chemie des Indols. 2. Mitteilung. �ber eine neue Aufbaumethode von ?-Carbolinen
作者:J. Kebrle、A. Rossi、K. Hoffmann
DOI:10.1002/hlca.19590420335
日期:——
A new synthesis of γ-carbolines is described. Starting from 2-lithium l-alkyl-indoles, reaction with an a-dialkylaminoketone yields 2-indolylethanolamines, which are aminomethylated with formaldehyde and dimethylamine in the 3-position of the indole nucleus. The dimethylaminomethyl nitrogen of this gramine derivative may be selectively quaternized with methyl iodide and the quaternary gramine derivative
描述了γ-咔啉的新合成。从2-锂-1-烷基吲哚开始,与α-二烷基氨基酮反应生成2-吲哚基乙醇胺,其在吲哚核的3-位被甲醛和二甲基胺氨甲基化。该草胺衍生物的二甲基氨基甲基氮可以用甲基碘选择性地季铵化,并且通过封端将季胺草胺衍生物环化为N(b)-季铵化的1-羟基-1,2,3,4-四氢-γ-咔啉衍生物。后者的产物可以在较高温度下被芳构化为季铵-咔啉衍生物。大量实例证明了这种新方法的普遍性。