Conversion of Some 2(3<i>H</i>)-Furanones into Pyrrolinotriazine and Oxazolopyrimidine Derivatives
作者:Wael S. I. Abou-Elmagd、Ahmed I. Hashem
DOI:10.1002/jhet.889
日期:2012.7
2(3H)‐Furanones 1 were utilized for the construction of pyrrolinotriazine and oxazolopyrimidine derivatives 4 and 9. Thus, 1 reacted with glycine in ethanol at 70°C to give the acids 2, which were cyclized into the pyrrolin‐5‐one derivatives 3 by the action of HCl/AcOH. The later compounds 3 were also obtained by refluxing the furanones 1 with glycine in glacial AcOH for 10 h. The carboxy functionality
2(3 H)-呋喃酮1用于构建吡咯并三嗪和恶唑并嘧啶衍生物4和9。因此,1在70°C的乙醇中与甘氨酸反应生成酸2,这些酸2在HCl / AcOH的作用下环化成为吡咯啉5一衍生物3。通过将呋喃酮1与甘氨酸在冰醋酸AcOH中回流10小时,也可以获得后来的化合物3。3中的羧基官能度通过用亚硫酰氯处理,然后将酰氯与肼在乙醇中回流,将其用于构建三嗪酮环。呋喃酮1向恶唑并嘧啶衍生物9的转化涉及以下步骤:(i)用水合肼将内酯环开环以得到酰肼5,(ii)通过以下方法将酰肼5转化为相应的酰叠氮6。 NaNO2 / AcOH的作用,(iv)在甘氨酸存在下碱催化的叠氮化物分解,(v)脲衍生物7闭环成嘧啶衍生物8,最后(vi)缩合8 在NaOAc / AcOH混合物存在下与苯甲醛反应。