Two Methods for the Preparation of 3-Dialkylaminomethyl Derivatives (Mannich Bases) of 4-Aminocoumarin: A New Type of Intramolecular Hydride Transfer
作者:Ivo C. Ivanov、Stoyan K. Karagiosov
DOI:10.1055/s-1995-3971
日期:1995.6
The transformation of 4-alkylaminocoumarin-3-carbaldehydes (1b-f) by treatment with secondary amines 2a-i into 3-dialkylaminomethyl-4-aminocoumarins 4a-i via intramolecular hydride transfer is reported. The structure of 4 was ascertained by independent Mannich reaction of 4-aminocoumarin (5) yielding the 3-dialkylaminomethyl derivatives 4a-e. By treatment of 1e with primary amine 6 only the usual Schiff base 7 was obtained.
报道了通过与二级胺 2a-i 处理 4-烷基氨基香豆醛 (1b-f),实现通过分子内氢转移转化为 3-二烷基氨基甲基-4-氨基香豆素 4a-i 的过程。 4 的结构通过独立的 Mannich 反应确认,该反应使用 4-氨基香豆素 (5) 生成 3-二烷基氨基甲基衍生物 4a-e。用初级胺 6 处理 1e,仅得到常规的舒夫碱 7。