7 紅藻ミツデソゾの新ブロムアレンの構造

概要

論文の詳細を見る
In connection with our continuing studies of the constituents of the red alga Laurencia okamurai Yamada, a Japanese species of genus Laurencia, we have examined a specimen collected at Bikuni, Hokkaido. This specimen yielded five nonterpenoid C-15 bromoallenes (A〜E) (Table 1) as the minor components together with laurinterol (1) and debromolaurinterol (2) as the major components. The structure of bromoallene-C, designated as okamurallene, was determined as formula 16 on the basis of the spectral evidence. Furthermore, the structures of bromoallene-E (isookamurallene) and -A (deoxyokamurallene) were deduced as formulas 17 and 18, respectively, by comparison of the spectral data with those of okamurallene (16). These bromoallenes are the first examples of the nonterpenoid C-15 metabolites from the genus Laurencia with a cyclopropane ring, a bromine atom at C-6 and a substituent at C-8. The structures of the remaining two bromoallenes (B and D) are currently being investigated.
天然有機化合物討論会の論文
1981-09-10