Synthesis of new 3<i>H</i>-chromeno[2,3-<i>d</i>]pyrimidine-4,6(5<i>H</i>,7<i>H</i>)-diones <i>via</i> the tandem intramolecular Pinner/Dimroth rearrangement
作者:Nasrin Karimi、Abolghasem Davoodnia、Mehdi Pordel
DOI:10.1515/hc-2017-0228
日期:2018.2.23
8-tetrahydro-4H-chromene-3-carbonitriles with excess aliphatic carboxylic acids in the presence of phosphoryl chloride (POCl3) afforded new 2-alkyl-5-aryl-8,8-dimethyl-8,9-dihydro-3H-chromeno[2,3-d]pyrimidine-4,6(5H,7H)-diones in high yields. The suggested mechanism involves a tandem intramolecular Pinner/Dimroth rearrangement. The synthesized compounds were characterized by infrared (IR), proton nuclear
摘要 2-氨基-4-芳基-7,7-二甲基-5-氧代-5,6,7,8-四氢-4H-色烯-3-腈与过量脂肪族羧酸在磷酰氯存在下的反应(POCl3) 以高产率提供了新的 2-烷基-5-芳基-8,8-二甲基-8,9-二氢-3H-色基[2,3-d]嘧啶-4,6(5H,7H)-二酮. 建议的机制涉及串联分子内 Pinner/Dimroth 重排。合成的化合物通过红外(IR)、质子核磁共振(1H NMR)、碳13核磁共振(13C NMR)和元素分析进行表征。