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Synthesis 2001(15): 2247-2254
DOI: 10.1055/s-2001-18436
DOI: 10.1055/s-2001-18436
PAPER
© Georg Thieme Verlag Stuttgart · New York
An Efficient Synthesis of Neoflavonoid Antioxidants Based on Montmorillonite K-10 Catalysis
Further Information
Received
5 July 2001
Publication Date:
05 August 2004 (online)
Publication History
Publication Date:
05 August 2004 (online)

Abstract
A new approach to synthesis of neoflavonoids, based on a high yielding Montmorillonite K-10 catalyzed lactone ring forming cyclization process, is described. The utility of this methodology is exemplified by its employment in the preparation of the substituted 4-phenylneoflavonoids 1-8. The free radical scavenging properties of these substances were evaluated. The neoflavonoids 1 and 5, which mimic esculetin-type antioxidants, were observed to quench hydrazyl free radicals.
Key words
montmorillonite K-10 - 4-phenylneoflavonoids - Fries rearrangement
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References
The X-ray data for 8, 9, 13 are deposited at CCDC as numbers 170003, 170002 and 170001, respectively.