Synthesis of some condensed pyrrolo-, thieno-, furo-, pyrido-and pyranopteridines as well as isomeric pyrrolo-and thienopyrimido [4,5-c]pyridazines from alkynyl derivatives of 6,8-dimethylpyrimido [4,5-c]pyridazine-5,7(6H,8H)-dione and 1,3-dimethyllumazine is represented.
Synthesis of some condensed pyrrolo‐, thieno‐, furo‐, pyrido‐ and pyranopteridines as well as isomeric pyrrolo‐ and thienopyrimido[4,5‐c]pyridazines from alkynyl derivatives of 6,8‐dimethylpyrimido[4,5‐c]pyridazine‐5,7(6H,8H)‐dione and 1,3‐dimethyllumazine is represented.
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