5-Ethyl-8-hydrazinofuro[2',3':4,5]pyrrolo[1,2-d][1,2,4]triazine (4a) and its 2-methyl derivative 4b were prepared from 4H-furo[3,2-b]pyrrole-5-carbohydrazides 1a and 1b, respectively. Compounds 1a and 1b reacted with triethyl orthopropionate to give 2a and 2b which afforded with phosphorus(V) sulfide corresponding thiones 3a and 3b. The title compounds 4a and 4b were made by treatment of 3a and 3b with hydrazine hydrate. By reactions of triethyl orthoesters with the title compounds and similar derivatives furo[2'3':4,5]pyrrolo[1,2-d][1,2,4]triazolo[3,4-f][1,2,4]triazines 5a-5j were prepared. Reactions of compounds 4 with some aldehydes and isocyanates led to hydrazones 6a-6c and semicarbazones 7a and 7b, respectively.
从4H-呋喃[3,2-b]吡咯-5-羟基脲化合物1a和1b分别合成了5-乙基-8-叠氮基呋喃[2',3':4,5]吡咯[1,2-d][1,2,4]三嗪(4a)及其2-甲基衍生物4b。化合物1a和1b与正丙酸三乙酯反应得到2a和2b,再与五价磷磺化合物反应形成相应的硫醚3a和3b。通过硫醚3a和3b与叠氮酸水合物反应制备了标题化合物4a和4b。通过正丙酸酯与标题化合物及类似衍生物的反应制备了呋喃[2'3':4,5]吡咯[1,2-d][1,2,4]三唑[3,4-f][1,2,4]三嗪5a-5j。化合物4与一些醛和异氰酸酯反应得到叠氮酮6a-6c和半胍酮7a和7b。