SYNTHESIS AND PROPERTIES OF HYDROGENATED 2-ALKYLTHIO-5-OXO-3-CYANOINDENO-PYRIDINES

Article abstract of DOI:10.1007/BF00506858

Condensation of 2-arylidene-1,3-indandiones with cyanothioacetamide in the presence of piperidine, followed by treatment with alkyl halides, has given partially hydrogenated 2-alkylthio-5-oxoindeno<1,2-b>-pyridines, the oxidation, interconversion, and Thorpe cyclization of which to give a novel heterocyclic system, indeno<1',2':6,5>pyrido<2,3-b>thiophene, have been examined.