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:

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

Communication | Special issue | Vol 73, No. 1, 2007, pp.237-240
Published online, 31st August, 2007
DOI: 10.3987/COM-07-S(U)43
A Novel Approach to 5,5’-Diisopropyl-3,3’-bi-2H-cyclohepta[b]furan-2-one

Noboru Morita,* Junya Higashi, Kazuyuki Okada, Taku Shoji, Kozo Toyota, Masataka Watanabe, Masafumi Yasunami, Shigeru Kikuchi, and Shunji Ito

*Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan


5-Isopropyl-2H-cyclohepta[b]furan-2-one (1) reacted with DMSD to give dimethyl(5-isopropyl-2-oxo-2H-cyclohepta[b]furan-3-yl)sulfonium trifluoromethanesulfonate (2), which was treated with Et3N to give 5-isopropyl-3-methylthio-2H-cyclohepta[b]furan-2-one (3). Sulfide 3 was oxidized with mCPBA to give sulfoxide 4 and sulfone 5. The salt 6 which comes from the treatment of 4 with Tf2O converted to an unexpected product, 5,5’-diisopropyl-3,3’-bi-2H-cyclohepta[b]furan-2-one (7), thermally.