简介：Reactionsofthe6-hydroxy-thiopyrano[3,4-c]pyridine-5-carbonitrilederivative1withα-halo-carbonylcompoundsgavetheortho-substitutedintermediates2a-cwhichwereconvertedintofuro[2,3-b]thiopyrano[4,3-d]pyridines3a-cbyfusionofafuranmoietyunderbasicconditions.Furthercyclizationof3a-cledtoafusionofapyrimidinering,yieldingthetetracyclicproducts6,7and8.Inaddition,condensationof6withvariousaromaticaldehydesaffordedthecorrespondingimines9a,b.Mannichreactionof7gaveproducts10a,b.
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![Synthesis of thiopyrano[<b style='color:red'>4</b>',3':<b style='color:red'>4</b>',5']pyrido[3',2':<b style='color:red'>4</b>, 5]furo[3,2-d]pyrimidines](/image/thesis0 "Synthesis of thiopyrano[<b style='color:red'>4</b>',3':<b style='color:red'>4</b>',5']pyrido[3',2':<b style='color:red'>4</b>, 5]furo[3,2-d]pyrimidines")