摘要
邻硝基苯胺(1,4)与芳香醛(2a-c)在连二亚硫酸钠存在下共热,发生还原关环反应,一步即可合成苯并咪唑类化合物(3a-c,5a-c).当起始物中含有不止一个硝基时,连二亚硫酸钠对硝基的还原有选择性.反应以乙醇-水为溶剂,水可加速反应进程.
Benzimidazoles (3a-c, 5a-c) were synthesized in a one step reduetive eyelization reaction of o-nitroanilines (1, 4) and aryl aldehydes (2a-c). Sodium dithionite was used as a reduetive reagent. Selectivity was found when more than one nitro group existed in the substrates. A mixture of ethanol and water was used as solvent. The reaction was accelerated by water.
出处
《上海大学学报(自然科学版)》
CAS
CSCD
北大核心
2007年第1期77-81,共5页
Journal of Shanghai University:Natural Science Edition