Synthesis of novel pyrido [3′,2′:5,6]thiopyrano[3,2-b]indol-5(6H)-ones and 6H-pyrido[3′,2′:5,6]thiopyrano[4,3-b]quinolines, two new heterocyclic ring systems

Article abstract of DOI:10.1002/jhet.5570390522

The synthesis of new pyrido [3′,2′: 5,6]thiopyrano [3,2-b]indol-5 (6H)-ones was accomplished by the Fischer-indole cyclization of some 2,3-dihydro-3-phenylhydrazonothiopyrano[2,3-b]pyridin-4(4H)-ones, obtained from the 2,3-dihydro-3-hydroxymethylenethiopy