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Synthesis of Thiadiazolinylpyrazolopyridine and Pyridopyrazolotriazine Derivatives

✍ Scribed by Attaby, Fawzy A.; Elneairy, Mohamed A. A.; Eldin, Sanaa M.; El-Louh, Ali K. K.

Book ID
121366335
Publisher
Chinese Electronic Periodical Services
Year
2001
Tongue
English
Weight
331 KB
Volume
48
Category
Article
ISSN
0009-4536

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## Abstract Esculetin (1) and the novel compounds 5‐chloroesculetin (5) and 5‐bromoesculetin (6) were obtained from a light‐induced cyclization of __trans__‐caffeic acid (3) catalyzed by [FeNa(edta)] and/or H~2~SO~4~, HCI, or HBr (__Scheme 1__). The experimental conditions for __trans__‐__cis__‐iso