Synthesis of heterocycles from arylation products of unsaturated compounds: XVIII. 5-Arylfuran-2-carboxylic acids and their application in the synthesis of 1,2,4-thiadiazole, 1,3,4-oxadiazole, and [1,2,4]triazolo[3,4-b][1,3,4]thiadiazole derivatives
作者:Yu. I. Gorak、N. D. Obushak、V. S. Matiichuk、R. Z. Lytvyn
DOI:10.1134/s1070428009040125
日期:2009.4
intermediate isoxazolylthiourea derivatives. The reactions of 5-arylfuran-2-carbonyl chlorides with 5-(2-furyl)-1H-tetrazole involved opening of the tetrazole ring with elimination of nitrogen molecule and led to the formation of 2-(5-arylfuran-2-yl)-5-(2-furyl)-1,3,4-oxadiazoles. 3-Substituted 6-(5-arylfuran-2-yl)-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles were obtained by condensation of 5-arylfuran-2-carboxylic
在氯化铜(II)存在下,将呋喃-2-甲酸或其甲酯与氯化芳二氮鎓进行氯化,得到相应的5-芳基呋喃-2-羧酸或5-芳基呋喃-2-羧酸甲酯。5-芳基呋喃-2-羰基氯与硫氰酸钾反应,然后与5-甲基-1,2-恶唑-3-胺反应,得到5-芳基-N- [3-(2-氧丙基)-1,2,4 -噻二唑-5-基]呋喃-2-甲酰胺是中间体异恶唑基硫脲衍生物再循环的结果。5-芳基呋喃-2-羰基氯化物与5-(2-呋喃基)-1 H-四唑的反应涉及四唑环的打开并消除了氮分子,并导致了2-(5-芳基呋喃-2-基)的形成。 yl)-5-(2-呋喃基)-1,3,4-恶二唑。3-取代的6-(5-芳基呋喃-2-基)-[1,2,4]三唑[3,4- b] [1,3,4]噻二唑是通过将5-芳基呋喃-2-羧酸与5-取代的4-氨基-4 H -1,2,4-三唑-3-硫醇在磷酰氯中缩合而获得的。