Synthesis of nitrogen-containing heterocycles<b>6</b>. Formation and structures of imidazolinones and related compounds through cyclization of diaminomethylenehydrazones with dimethyl acetylenedicarboxylate
作者:Yoshiko Miyamoto、Chiji Yamazaki
DOI:10.1002/jhet.5570310626
日期:1994.11
Diaminomethylenehydrazones 1 of aromatic and aliphatic carbonyl compounds react with dimethyl acetylenedicarboxylate (DMAD) at room temperature to give four types of heterocycles, (5-oxoimidazolin-4-ylidene) acetates 2, 3 and 6, (2-imino-5-oxoimidazolidin-4-ylidene) acetate 4 and 6-oxo-1,6-dihydropyrimidine-4-carboxylates 5 according to the substitution patterns of 1 in moderate to high yields. Amino
Diaminomethylenehydrazones 1芳香族和脂肪族羰基化合物与在室温下乙炔二(DMAD)反应,得到四种类型的杂环,(5-oxoimidazolin -4-亚基)乙酸盐2,3和6,(2-亚氨基-5-氧代咪唑烷根据1的取代模式,乙酸4-亚烷基酯4和6-氧代1,6-二氢嘧啶-4-羧酸酯5具有中等至高收率。酮的氨基(N,N-二甲基氨基)亚甲基hydr仅生成(Z)-和(E)-异构体2和3的(5-氧代咪唑啉-4-基-亚乙基)乙酸酯(Z)-异构体2通常占主导地位,而醛基则为5。二氨基和氨基(N-甲基氨基)亚甲基hydr产生5和/或6,而二(N-甲基氨基)亚甲基gives得到(2-亚氨基-5-氧代咪唑啉丁-4-亚烷基)乙酸酯4作为唯一的环化产物。