Two new cytotoxic macrolides, amphidinolides R (1) and S (2), were isolated from the cultured marinedinoflagellateAmphidiniumsp. and their structures including absolute configuration were elucidated on the basis of spectroscopic data as well as chemical experiments. In a feeding experiment of 13C-labeled succinic acid into a culture of Amphidiniumsp., no enrichment of the 13C NMR signal intensity
两种新的细胞毒性大环内酯类,两性内酯R(1)和S(2),从培养的海洋鞭毛鞭状菌Amphidinium sp中分离出来。根据光谱数据和化学实验阐明了它们的结构,包括绝对构型。在将13 C标记的琥珀酸进料到Amphidinium sp。的培养实验中,未观察到任何碳的安非他命J(3)(该鞭毛中最丰富的大环内酯)的13 C NMR信号强度富集。
The marine natural product amphidinolide J has been synthesized according to a convergent strategy. The key steps of this synthesis include a B-alkyl Suzuki-Miyaura coupling and the addition of an alkynyllithium reagent to a Weinreb amide to build the C4-C5 and C12-C13 bonds, respectively, and a Yamaguchi macrolactonization.