作者:Nehad A. Abdel-Latif
DOI:10.3797/scipharm.aut-05-15
日期:——
e with o-phenylenediamine in refluxing ethanol led to the formation of 10a-c as intermediate, followed by cleavage by thermolysis to benzimidazole derivative 11 along with compounds 12a-c as mixture, which were obtained directly by fusion of a,&unsaturated ketones 2 with ophenylene diamine at 200-220°C, while compound 11 could be prepared in pure form by fusion of 1 with o-phenylene diamine at the
香豆素-3-肉桂酰基衍生物2a-d是通过3-乙酰基香豆素1与不同的芳族醛的克莱森-施密特缩合制备的。2b,e与胍和硫脲的环加成反应分别得到相应的氨基嘧啶3a,b和硫代嘧啶衍生物4a,b。将化合物4a,b与氯乙酸或3-溴丙酸缩合,分别得到香豆素3-噻唑并嘧啶5a,b和噻嗪并嘧啶6a,b的衍生物。将化合物4a,b与氯乙酸和芳族醛缩合,得到芳基亚甲基衍生物7a,b,其可以通过化合物5a,b与芳族醛的缩合直接制备。在乙酸铵存在下,将化合物2a-e与丙二腈或乙酸氰基乙酯缩合,得到氰基吡啶8a,b和氰基吡啶酮9a-d衍生物,它们是通过3-乙酰香豆素1,丙二腈或氰基乙酸乙酯与乙酸醛存在下的芳族醛缩合而制得的。化合物2a,b,e与邻苯二胺在回流的乙醇中缩合导致形成10a-c作为中间体,然后通过热解裂解为苯并咪唑衍生物11以及化合物12a-c作为混合物,它们是通过熔融直接获得的在200-220℃下用α-不饱