Synthesis and properties of 1,3-dimethyl-6-azalumazines (Isofervenulins).
作者:FUMIO YONEDA、TOMOHISA NAGAMATSU、KAZUKO OGIWARA、MICHIKO KANAHORI、SADAO NISHIGAKI、EDWARD C. TAYLOR
DOI:10.1248/cpb.26.367
日期:——
A new synthesis of 1, 3-dimethyl-6-azalumazines (isofervenulins) is described. The reaction of 6-amino-1, 3-dimethyl-5-nitrosouracil (I) with acid hydrazides in refluxing aprotic solvents such as dimethylformamide (DMF), dimethyl sulfoxide (DMSO) or sulfolane affords the corresponding 1, 3-dimethyl-6-azalumazines (II) along with byproducts, 2, 4, 9, 11-tetramethyl-8-azapurino [7, 8-f]-6-azapteridine-1, 3, 10, 12 (2H, 4H, 9H, -11H)-tetrones (III). These 8-azapurino [7, 8-f]-6-azapteridines were alternatively prepared by the condensation of II with 6-amino-1, 3-dimethyluracil in refluxing DMF. Compounds II were converted into 8-substituted theophyllines (V) by reductive ring contraction with sodium dithionite in formic acid.
描述了一种新的1, 3-二甲基-6-氮杂呋喃类化合物(异佛尔嫩)合成方法。6-氨基-1, 3-二甲基-5-亚硝基尿嘧啶(I)与酸性肼在回流的无原子溶剂中(如二甲基甲酰胺(DMF)、二甲基亚砜(DMSO)或磺烷)反应,生成相应的1, 3-二甲基-6-氮杂呋喃类化合物(II),以及副产品2, 4, 9, 11-四甲基-8-氮杂嘌呤[7, 8-f]-6-氮基哌啶-1, 3, 10, 12(2H, 4H, 9H, -11H)-四烯酮(III)。这些8-氮杂嘌呤[7, 8-f]-6-氮基哌啶也可以通过将II与6-氨基-1, 3-二甲基尿嘧啶在回流的DMF中缩合制备。化合物II通过在甲酸中与亚硫酸钠进行还原环收缩反应转化为8-取代茶碱(V)。