Facile intramolecular Diels–Alder reaction of 4-(o-propargyloxy)styrylcoumarins leading to highly fluorescent coumarin-containing polycyclic compounds
作者:Adil I. Khatri、Shriniwas D. Samant
DOI:10.1016/j.tetlet.2014.02.102
日期:2014.4
O-propargylated salicylaldehyde with substituted coumarin-4-acetic acids. The intramolecular Diels–Alder reaction of 4-(o-propargyloxy)styrylcoumarins, without any catalyst gives fused-ring coumarins. The reaction in boiling nitrobenzene leads to aromatization of the initial Diels–Alder adduct and these aromatized products are highly fluorescent.
4-(邻-炔丙基氧基)苯乙烯基香豆素是通过将邻-炔丙基化的水杨醛与取代的香豆素-4-乙酸缩合而制备的。4-(邻-炔丙基氧基)苯乙烯基香豆素的分子内Diels-Alder反应,无需任何催化剂,即可得到稠环香豆素。沸腾的硝基苯中的反应导致最初的Diels–Alder加合物芳构化,这些芳构化的产品具有很高的荧光性。