Ring transformations of heterocyclic compounds. XXIV. 1′,2′,5′,6′-Tetrahydro-4′H-spiro[cyclohexa-2,4-diene-1,2′-pyrrolo[3,2,1-ij]quinoline] and 1,2,4,5,6,7-hexahydrospiro[azepino[3,2,1-hi]indole-2,1′-cyclohexa[2,4]diene] – Two new spiro[cyclohexadiene-azaheterocycles] easily accessible by pyrylium ring transformation

✍ Scribed by Thomas Zimmermann

• Publisher: Journal of Heterocyclic Chemistry
• Year: 2004
• Tongue: English
• Weight: 144 KB
• Volume: 41
• Category: Article
• ISSN: 0022-152X
• DOI: 10.1002/jhet.5570410506

✦ Synopsis

Dedicated to the memory of Mrs. Ada Castle

The ring transformation of 2,4,6-triarylpyrylium salts 1 with 2-methyleneindolines of the type 3 in which the nitrogen atom is connected with the ortho-carbon of the benzene ring by a (CH 2 ) n chain is studied.