1,9,8-cyclization of 1,8-disubstituted anthraquinones. 12H-benzo[m,n]chromeno [2,3,4-k,l]kacridine derivatives |
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Authors: | S V Reznichenko V P Shapkin S I Popov |
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Institution: | (1) Scientific-Research Institute of Organic Intermediates and Dyes, Moscow |
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Abstract: | The cyclization of 1-(2,5-dihalophenylamino)-8-hydroxyanthraquinones or the corresponding 8-methoxycompounds in concentrated sulfuric acid has given derivatives of a new hexanuclear heterocyclic system —12H-benzom,n]chromeno 2,3,4-k,l]acridine. It has been shown that the double cyclization takes place initially through the closure of the pyridine ring with the formation of 9H-napth3,2,1-k,l]acridine, the product of 1,9-cyclization. Under the reaction conditions the latter undergoes intramolecular aroxylation with the formation of a pyran ring under a-typical conditions.Translated from Khimiya GeterotsiklicheskikhSoedinenii, No. 4, pp. 519–523, April, 1980. |
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