从N-桥联稠合双环化合物(如咪唑并[1,2- a ]吡啶,咪唑并[1,2- a ]嘧啶和咪唑并[2,1- b ]噻唑)合成的简便且环境友好的方案已经开发了可商购的原料。反应是通过NBS介导的原位形成相应芳族酮,1,3-二酮,β-酮酯的α-溴化中间体进行的,然后用适当的亲核试剂进行捕集,以提供在金属-金属化条件下高收率的这些通用的咪唑稠合双环杂环化合物。免费条件。
tetrabromide mediated oxidative carbon–nitrogen bond formation of 2-aminopyridines or 2-aminopyrimidines with β-keto esters or 1,3-diones, leading to a variety of complex imidazo[1,2-α]pyridines or imidazo[1,2-α]pyrimidines, is reported. The reactions were realized under mild and metal-free conditions.
The synthesis of a group of 2-methylimidazo[1,2-a]pyrimidine-3-carboxylic esters, acids and amides is described. The structures of new compounds are supported by H-1 and C-13 NMR spectre. These compounds were tested in vivo for their antiinflammatory, analgesic. and ulcerogenic activity. Eight new compounds out of fifteen showed remarkable dose-dependent antiinflammatory action in the carrageenan rat paw edema (1/2-1/3 x indomethacin) but weak analgesic activity in the acetic acid writhing test together with negligible ulcerogenic action. The new compounds were found to be lacking in inhibitory activity on cyclooxygenase in vitro. (C) Elsevier, Paris.
Abignente; Arena; Luraschi, Farmaco, Edizione Scientifica, 1984, vol. 39, # 5, p. 379 - 388
Structural modification of zolpidem led to potent antimicrobial activity in imidazo[1,2-<i>a</i>]pyridine/pyrimidine-1,2,3-triazoles
作者:Rajkumar Reddyrajula、Udaya Kumar Dalimba
DOI:10.1039/c9nj03462e
日期:——
New imidazo[1,2-a]pyridine/pyrimidine-1,2,3-triazoles (IPTs) designed by specific structural modifications of zolpidem exhibited superior antitubercular activity than the parent compound.