Acid-Catalyzed Reactions of Sarcophytoxide, a Marine Cembranoid: An Apparently Enantio-Directive Reaction, Unusual Products and Stereochemical Reconsideration of Epoxide–Ketone Rearrangement
Perchloric acid treatment of sarcophytoxide, a marine cembranoid possessing an epoxide, brought about epoxide–ketone rearrangement affording ketones. When the reaction time was long (22 h), a minor...
Marine Terpenes and Terpenoids. XIII. Isolation of a New Dihydrofuranocembranoid, Sarcophytonin E, from the Sarcophyton sp. Soft Coral of Okinawa.
作者:Masaru KOBAYASHI、Takumi HIRASE
DOI:10.1248/cpb.39.3055
日期:——
A new dihydrofuranocembranoid, sarcophytonin E (1a), was isolated from the Sarcophyton sp. soft coral of Chatan, Okinawa. The structure of 1a was derived from the spectroscopic data, and was confirmed by correlation with the known compound 16-deoxosarcophine (2a). Compound 1a was found to be converted, on storage, to the butenolide 3a. The proton nuclear magnetic resonance spectra of the 2-methoxy-2-trifluoromethylphenylacetic acid esters of 1a and 3a indicated that they are enantiomerically pure, and showed our previous assumption, that the cembranoids isolated from this soft coral are enantiomeric mixtures, to be incorrect.