Synthesis of fluorescent dibenzopyranones by the Diels-Alder reaction of 4-styrylcoumarins and N-phenylmaleimide and in situ aromatization using DDQ
作者:Kailas K. Sanap、Shriniwas D. Samant
DOI:10.3998/ark.5550190.0014.309
日期:——
Reaction of 7-substituted-4-styrylcoumarins and N-phenylmaleimide in nitrobenzene under reflux conditions affords mainly 7-substituted-2,11-diphenyl-3a,10,11,11a-tetrahydro(1)- benzopyrano(3,4-e)isoindole-1,3,4(2 H)-triones. The same reaction in o-dichlorobenzene in the presence of DDQ gives the corresponding aromatized dibenzopyranones. The dibenzopyranones are fluorescent and their UV and fluorescence
7-取代-4-苯乙烯基香豆素和N-苯基马来酰亚胺在硝基苯中在回流条件下反应主要得到7-取代-2,11-二苯基-3a,10,11,11a-四氢(1)-苯并吡喃(3,4-e) )isoindole-1,3,4(2H)-triones。在 DDQ 存在下,在邻二氯苯中的相同反应得到相应的芳构化二苯并吡喃酮。二苯并吡喃酮是荧光的,并报告了它们的紫外和荧光光谱。