A novel and direct synthetic route to substituted 1,5‐dihydro‐4H‐[1]benzopyrano[4,3‐b]pyridine‐4,5‐diones |
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| Authors: | Jan Sv tlík Nad'A Prnayov Vladimír Hanu&#x; |
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| Institution: | Jan Světlík,Nad'A Prónayová,Vladimír Hanuš |
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| Abstract: | The condensation of 4‐hydroxy‐6‐methyl‐2H‐pyran‐2‐one and substituted 2‐hydroxybenzaldehydes with ammonium acetate gave the title heterocycles. Synthesis of 1,5‐dihydro‐2‐methyl‐4H‐1]naphtho‐1′,2′:5,6]pyrano4,3‐b]‐pyridine‐4,5‐dione is also described. A reaction mechanism is discussed. |
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