Studies of the Synthesis of Furan Compounds. XXIII. Cyclization Derivatives of 5-Nitro-2-furimidoylhydrazine
作者:Ichiro Hirao、Yasuhiko Kato、Tsunetoshi Hayakawa、Hiromichi Tateishi
DOI:10.1246/bcsj.44.780
日期:1971.3
3-(5-nitro-2-furyl)-1,2,4-triazole (V) was produced. The reactions of I with cyanogen bromide in refluxing methanol and with nitrous acid in diluted hydrochloric acid gave the corresponding 3-(5-nitro-2-furyl)-5-amino-1,2,4-triazole (VI) or -1,2,4,5-tetrazole (VIII) respectively. When heated in acetic anhydride, the VI afforded monoacetyl compound (VII), while the VIII yielded 5-(5-nitro-2-furyl)-2-methyl-1,3,4-oxadiazole
5-硝基-2-呋喃酰亚胺酰肼(I)与二乙酰或呋喃反应得到3-(5-硝基-2-呋喃基)-5,6-二取代-1,2,4-三嗪衍生物(IIa,b)。在大量过量的原甲酸乙酯中回流 I,得到 3-(5-nitro-2-furyl)-5-ethoxy-1,2,4-triazoline (III) 和双 [3-(5-nitro-2-furyl) -1,2,4-三唑基]甲基乙基醚 (IV)。通过与原甲酸乙酯加热,III转化为IV。当III或IV在稀硫酸中加热时,产生3-(5-硝基-2-呋喃基)-1,2,4-三唑(V)。I与溴化氰在回流甲醇中和亚硝酸在稀盐酸中反应得到相应的3-(5-硝基-2-呋喃基)-5-氨基-1,2,4-三唑(VI)或-1 ,2,4,5-四唑 (VIII)。在乙酸酐中加热时,VI 得到单乙酰化合物 (VII),而 VIII 得到 5-(5-nitro-2-furyl)-2-methyl-1,3