Synthesis, crystal structure, and in vitro antiprotozoal activity of some 5-phenyl(methyl)sulfonyl-substituted dihydroisoxazoles
摘要:
4,5-Dihydroisoxazole derivatives are interesting synthetic targets that exhibit various biological activities, including anti-infective. Taking account of the principle of bioisosterism, a number of 4,5-dihydroisoxazoles carrying a phenyl- (or methyl-)sulfonyl group at position 5 were designed and synthesized by 1,3-dipolar cycloaddition of nitrolic acid-generated nitrile oxides with electron-deficient phenyl (or methyl) vinyl sulfones. The structures of all the cycloadducts were elucidated by means of spectroscopic methods (NMR, MS), X-ray diffraction, and physical characteristics. The in vitro antiprotozoal and cytotoxic activities of these heterocyclic compounds were investigated.
Tandem nitrosation/cycloaddition of heterocyclic enamines using nitrolic acids
作者:Cevher Altuğ、Yasar Dürüst、Mark C. Elliott、Benson M. Kariuki
DOI:10.1016/j.tetlet.2009.06.065
日期:2009.8
The reaction of alkylidenepyrrolidines with nitrolic acids gives rise to the formation of novel 3,7a-disubstituted (1,2,4-oxadiazol-5-yl)-5,6,7,7a-tetrahydropyrrolo[1,2-d][1,2,4]oxadiazoles. A plausible mechanism for this reaction is proposed, which features nitrosation of the enamine by the nitrousacid that is liberated from the nitrolic acid.
亚烷基吡咯烷与硝酸反应生成新的3,7a-二取代的(1,2,4-恶二唑-5-基)-5,6,7,7a-四氢吡咯并[1,2- d ] [ 1,2,4]恶二唑。提出了该反应的合理机理,其特征在于烯胺被从硝酸中释放的亚硝酸亚硝化。