制备了一系列具有潜在生物活性的新型芳氧基甲基喹喔啉,苯并[ b ]-和萘并[ 2,1- b ]呋喃基喹喔啉,并通过红外光谱和核磁共振谱进行了表征,并对其电子电离(EI)质谱进行了详细研究。通过使卤代甲基喹喔啉与双官能O-亲核试剂反应获得芳氧基甲基喹喔啉。所述苯并[ b ] furylquinoxalines和萘并[2,1- b通过两个途径制备]呋喃基喹喔啉,这两个途径在合成中涉及的两个环化步骤的顺序上是不同的。通过精确的质谱测量确定了通过EI质谱法获得的离子的组成,并通过B / E链接扫描和碰撞诱导的离解阐明了裂解途径。研究的化合物的质谱行为与可能的OH损失有关 自由基被证明是非常有特色的。
Microwave Assisted Multi-Component Synthesis of Novel Bis(1,4-dihydropyridines) Based Arenes or Heteroarenes
作者:Ahmed H. M. Elwahy、Ismail A. Abdelhamid、Sherif M. H. Sanad、Refaie M. Kassab
DOI:10.3987/com-16-13441
日期:——
A synthesis of novel bis-1,4-DHPs was reported. Two possible synthetic approaches for these compounds were investigated. In the first approach the monopodal 1,4-DHPs were used as building blocks for the construction of the target molecules via a simple alkylation. In the second strategy the appropriate bis-aldehydes have been synthesized in a first step followed by reaction with four equivalents of 3-aminobut-2-enenitrile using different catalysts under microwave irradiation as well as under conventional heating to give the corresponding bis-1,4-DHPs in good to excellent yield. The oxidative aromatization of some derivatives of the latter compounds into the corresponding bis-2,6-dimethylpyridine-3,5-dicarbonitrile derivatives was achieved using ceric ammonium nitrate (CAN).