N-Alkylation of benzimidazoles with ketonic Mannich bases and the reduction of the resulting 1-(3-oxopropyl)benzimidazoles
作者:Gheorghe Roman
DOI:10.2478/s11532-012-0062-x
日期:2012.10.1
position 2, and 5,6-dimethylbenzimidazole have been alkylated at N 1 with ketonic Mannich bases derived from acetophenones, acetylnaphthalenes, 2-acetylthiophene and 1-tetralone to afford a series of novel 1-(3-oxopropyl)benzimidazoles. The reduction of these transamination products with NaBH4 in methanol produced the corresponding 1-(3-hydroxypropyl)benzimidazoles in excellent yields.
苯并咪唑,在2位被不同取代的苯并咪唑和5,6-二甲基苯并咪唑已在 N 1被衍生自苯乙酮,乙酰萘,2-乙酰基噻吩和1-四氢萘酮的酮基曼尼希碱烷基化, 从而制得一系列新型的1-(3-氧代丙基) )苯并咪唑 在甲醇中用NaBH 4还原这些氨基转移产物可产生相应的1-(3-羟丙基)苯并咪唑类,产率很高。