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.
Reaction of heterocyclic enamines with nitrile oxide and nitrilimine precursors
作者:Cevher Altuğ、Yasar Dürüst、Mark C. Elliott、Benson M. Kariuki、Tillique Rorstad、Mark Zaal
DOI:10.1039/c0ob00286k
日期:——
Alkylidenepyrrolidines 1, 21, 24 and 26 undergo reactions with nitrile oxides and nitrilimines or their precursors to give a range of novel heterocycliccompounds. With alkylidenepyrrolidine ester 1, nitrolic acids give products in which the liberated nitrous acid reacts with the alkylidenepyrrolidine, followed by two cycloadditions to give adducts 3. In contrast, hydroximoyl chlorides give isoxazoles