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.
Allyl Alcohol as an Acrolein Equivalent in Enantioselective C–C Coupling: Total Synthesis of Amphidinolides R, J, and S
作者:Cole C. Meyer、Katherine L. Verboom、Madeline M. Evarts、Woo-Ok Jung、Michael J. Krische
DOI:10.1021/jacs.3c01809
日期:——
The first systematic study of catalytic enantioselective 1,2-additions to acrolein is described. Specifically, using allyl alcohol as a tractable, inexpensive acrolein proelectrophile, iridium-catalyzed acrolein allylation is achieved with high levels of regio-, anti-diastereo-, and enantioselectivity. This process delivers 3-hydroxy-1,5-hexadienes, a useful compound class that is otherwise challenging
描述了丙烯醛催化对映选择性 1,2-加成的首次系统研究。具体而言,使用烯丙醇作为易于处理的、廉价的丙烯醛亲电子试剂,实现了铱催化的丙烯醛烯丙基化,具有高水平的区域选择性、反非对映选择性和对映选择性。该过程产生 3-羟基-1,5-己二烯,这是一种有用的化合物类别,否则很难通过对映选择性催化获得。该方法的两次使用解锁了两栖内酯 R(9 vs 23 步骤,LLS)和两栖内酯 J(9 vs 23 或 26 步骤,LLS)的简明全合成,其制备步骤少于以前可能的一半,并且首次全合成 amphidinolide S(10 步,LLS)。