Abstract
New quinoline derivatives functionalized with various fused or linked heterocycles were prepared, and their structures were elucidated by IR, NMR, and mass spectra. 2-(Quinolin-8-yloxy)acetohydrazide (QAH) was synthesized starting from quinolin-8-ol and used to obtain pyrazole derivatives by cyclization with ethyl cyanoacetate, ethyl acetoacetate, and benzoylacetone. A series of pyrano[3,2-h]quinoline derivatives fused to pyrimidine and thiazine moieties were obtained via one-pot three-component condensation of 8-hydroxy-quinoline with substituted aromatic aldehydes and malononitrile and ethyl acetoacetate, followed by cyclization with acetic anhydride and ethyl isothiocyanate, respectively.