12H-naphtho[1′,2′:5,6]pyrano[2,3-d]pyrimidine derivatives |
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Authors: | Giorgio Roma Aldo Ermili Mauro Mazzei |
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Abstract: | Reaction of 1-oxo-2-formyl-3-dimethylamino-1H-naphtho2,1-b]pyran with amidines, guanidine, O-methylisourea, S-methylisothiourea afforded 9-substituted 12-oxo-12H-naphtho1′,2′:5,6]pyrano2,3-d]pyrimidines. When the reaction with O-methylisourea was carried out in anhydrous pyridine, 10,20-dioxo-10H,20H-dinaphtho1,2-e:1′,2′-e′]1,5]diazocino2,3-b:6,7-b′]dipyran was formed. |
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