Online article for Non-subscribers

Pay per view

Heterocycles has a pay-per-view service for Non-subscribers.
You will be able to directly purchase the full text article through PayPal.
Your purchased Paper can be downloaded after the payment is completed.
An e-mail will be sent the URL to download the paper.
If you have any questions, please contact: purchase@heterocycles.com

Price: ¥ 4,400 (Yen only)
Period: This Article can be accessed for 7 days.

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

Abstract

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.