Marine Natural Products. XXVIII. The Structures of Sarasinosides A1, A2, A3, B1, B2, B3, C1, C2, and C3, Nine New Norlanostane-Triterpenoidal Oligoglycosides from the Palauan Marine Sponge Asteropus sarasinosum.
作者:Motomasa KOBAYASHI、Yoshihiro OKAMOTO、Isao KITAGAWA
DOI:10.1248/cpb.39.2867
日期:——
The chemical structures of sarasinosides A1, A2, A3, B1, B2, B3, C1, C2, and C3, nine 30-norlanostane-triterpenoidal oligoglycosides isolated from the Palauan marine sponge Asteropus sarasinosum have been elucidated on the basis of chemical and physicochemical evidence. Sarasinosides A2 (2) and A3 (3) were shown to be the 7, 9(11)-diene and 8, 14-diene analogs of sarasinoside A1 (1), whereas sarasinosides B2 (7) and B3 (9) were the 7, 9(11)-diene and 8, 14-diene analogs of sarasinoside B1 (5), respectively. Similar structural correlations of sarasinosides C2 (6) and C3 (8) with sarasinoside C1 (4) were demonstrated. These sarasinosides characteristically contain one mole each of N-acetyl-glucosamine and N-acetylgalactosamine in their oligosaccharide moieties.
根据化学和物理化学证据,阐明了从帕劳海洋海绵 Asteropus sarasinosum 分离出的九种 30-去甲龙脑三萜类低聚糖苷的化学结构。研究表明,沙拉苷 A2 (2) 和 A3 (3) 分别是沙拉苷 A1 (1) 的 7、9(11)-二烯和 8、14-二烯类似物,而沙拉苷 B2 (7) 和 B3 (9) 分别是沙拉苷 B1 (5) 的 7、9(11)-二烯和 8、14-二烯类似物。沙拉糖苷 C2 (6) 和 C3 (8) 与沙拉糖苷 C1 (4) 也有类似的结构关联。这些沙星苷的特点是在其寡糖分子中分别含有一摩尔的 N-乙酰氨基葡萄糖和 N-乙酰半乳糖胺。