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Note | Regular issue | Vol 45, No. 11, 1997, pp.2273-2276
Published online, 1st January, 1970
DOI: 10.3987/COM-97-7947
Ring-Expansion of 2-Methylbenzo[b]furan to 3-Hydroxychromen-4-one: A Potential Approach to a Flavonol Skeleton

Tsutomu Ishikawa* and Chizue Miwa

*Faculty of Pharmaceutical Sciences, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan


A 2-methylbenzo[b]furan, prepared by the CsF-mediated Claisen rearrangement of a propargyl ether, could be smoothly transformed into a 3-hydroxychromen-4-one, a potential flavonol skeleton, by three successive treatment with NBS, OsO4, and Na2SO3.