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.
从冲绳岛查坦(Chatan)软珊瑚中分离出了一种新的二氢
呋喃类植物激素--石杉碱 E(1a)。根据光谱数据推导出了 1a 的结构,并通过与已知化合物 16-脱氧肉碱(2a)的相关性得到了证实。发现化合物 1a 在储存过程中会转化为
丁烯内酯 3a。1a 和 3a 的 2-甲氧基-2-三
氟甲基
苯乙酸酯的质子核磁共振光谱显示,它们的对映体是纯的,这表明我们之前关于从这种软珊瑚中分离出的
钙镁酸盐是对映体混合物的假设是错误的。