1984
DOI: 10.1007/bf00506972
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Synthesis of diquinolinoanthracene and pyridonoanthraquinolines

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“…Acid-catalyzed cyclizations of anthraquinone and anthrapyridone derivatives, reported by Kazankov, Bernadskii, and Mustafina, yielded benzannulated 1,8-diazapyrenes shown in Scheme 88. 486 Specifically, compound 88.8 was prepared in two steps, by refluxing 88.6 in polyphosphoric acid and subsequent heating of the intermediate 88.7 in the presence of aniline. The overall yield of the latter sequence was improved to 64% when the order of steps was reversed.…”
Section: Chemical Reviewsmentioning
confidence: 99%
“…Acid-catalyzed cyclizations of anthraquinone and anthrapyridone derivatives, reported by Kazankov, Bernadskii, and Mustafina, yielded benzannulated 1,8-diazapyrenes shown in Scheme 88. 486 Specifically, compound 88.8 was prepared in two steps, by refluxing 88.6 in polyphosphoric acid and subsequent heating of the intermediate 88.7 in the presence of aniline. The overall yield of the latter sequence was improved to 64% when the order of steps was reversed.…”
Section: Chemical Reviewsmentioning
confidence: 99%