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Synthesis of novel 5H, 11H-pyrido[2′,3′:2,3]thiopyrano[4,3-b]-indoles by fischer-indole cyclization

✍ Scribed by Antonio Da Settimo; Anna Maria Marini; Giampaolo Primofiore; Federico Da Settimo; Silvia Salerno; Concettina La Motta; Gianluca Pardi; Pier Luigi Ferrarini; Claudio Mori

Publisher
Journal of Heterocyclic Chemistry
Year
2000
Tongue
English
Weight
222 KB
Volume
37
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

The synthesis of the title compounds 5__H__, 11__H__‐pyrido[2′,3′:2,3]thiopyrano[4,3‐b]indoles was accomplished by the Fischer indole cyclization of some 2,3‐dihydrothiopyrano[2,3‐b]pyridin‐4(4__H__)‐one phenylhydrazones and 7‐methyl‐2,3‐dihydrothiopyrano[2,3‐b]pyridin‐4(4__H__)‐one phenylhydrazones. The synthesis of the new 2,3‐dihydrothiopyrano[2,3‐b]pyridin‐4(4__H__)‐one, which was used as one of the starting compounds, is also described.

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