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Heteroaromatization with 4-phenyldiazenyl-1-naphthol. Part I: Synthesis of some new naphthopyrans and naphthopyranopyrimidines Radini, Ibrahim Ali Abd El-Wahab, Ashraf Hassan Fekry Naphthopyran α-Cyanocinnamonitriles Ethyl α-cyanocinnamates Naphthopyranopyrimidines 4-Phenyldiazenyl-1-naphthol 4-(p-Tolyldiazenyl)-1-naphthol Reaction of 4-phenyldiazenyl /or 4-(p-tolyldiazenyl)-1-naphthol (1) with various substituted α-cyanocinnamonitriles (2a-h) and ethyl α-cyanocinnamates (2i-p) afforded 2-amino-4-(aryl)-6-(phenyldiazenyl /or p-tolyldiazenyl)-4H-naphtho[1,2-b]pyrano-3-carbonitrile (3a-h) and ethyl 2-amino-4-(aryl)-6-(phenyldiazenyl /or p-tolyldiazenyl)-4H-naphtho[1,2-b]pyrano-3-carboxylate (3i-p). Reaction of compound 3a with Ac2O or PhCOCl and formic acid afforded N-acetylamino or N,N-dibenzoylamino and naphthopyranopyrimidine derivatives (4-8), respectively. The structures of these compounds were established on the basis of IR, UV, 1H NMR, 13C NMR, and MS data. Atlanta Publishing House LLC 2016-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/1432 10.5155/eurjchem.7.2.230-237.1432 European Journal of Chemistry; Vol. 7 No. 2 (2016): June 2016; 230-237 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/1432/pdf_1432