New method for the annelation of a pyridine ring on derivatives of imidazole and benzimidazole
作者:L. M. Potikha、A. R. Turelyk、V. A. Kovtunenko、A. V. Turov
DOI:10.1007/s10593-010-0474-5
日期:2010.5
nyl)-1H-imidazolium bromides and (Z)-1-R-3-(2,4-diaryl-4-oxo-2-butenyl)-1H-benzimidazolium bromides which readily cyclize in the presence of base to form derivatives of 7,9-diarylpyrido[1,2-a]benzimidazole and 6,8-diarylpyrimidazo[1,2-a]pyridine. The effects of the nature of substituents in the benzene ring of the diarylbutenones and the substituent at N(1) in the (benz)imidazoles on the alkylation
(Z)-1,3-二芳基-4-溴-2-丁烯-1-酮与1-取代的(苯并)咪唑在苯中的相互作用得到(Z)-1-R-3-(2,4-二芳基-4-氧代-2-丁烯基)-1H-咪唑溴化物和(Z)-1-R-3-(2,4-二芳基-4-氧代-2-丁烯基)-1H-苯并咪唑溴化物在碱的存在下形成7,9-二芳基吡啶并[1,2-a]苯并咪唑和6,8-二芳基嘧啶并[1,2- a ]吡啶的衍生物。研究了二芳基丁烯酮的苯环中取代基的性质以及(苯)咪唑中N(1)处的取代基的性质对烷基化和环化反应的影响。合成5-R-4-羟基-2,4-二苯基-4,5-二氢-1H-吡啶基[1,2- a]的最佳条件]苯并咪唑-10-鎓,5-R-2,4-二芳基-4-羟基-4,5-二氢-3H-吡啶并[1,2-a]苯并咪唑-10-鎓和5-R-已发现2,4-二芳基-5H-吡啶并[1,2-a]苯并咪唑-10。