Total Synthesis of (+)-Amphidinolide A. Structure Elucidation and Completion of the Synthesis
作者:Barry M. Trost、Paul E. Harrington、John D. Chisholm、Stephen T. Wrobleski
DOI:10.1021/ja053365y
日期:2005.10.1
The structureelucidation of (+)-amphidinolide A, a cytotoxic macrolide, has been accomplished by employing a combination of NMR chemical shift analysis and totalsynthesis. The 20-membered ring of amphidinolide A was formed by a ruthenium-catalyzed alkene-alkyne coupling to forge the C15-C16 bond. Using the reported structure 1 as a starting point, a number of diastereomers of amphidinolide A were
(+)-amphidinolide A(一种细胞毒性大环内酯)的结构解析是通过结合核磁共振化学位移分析和全合成完成的。通过钌催化的烯烃-炔烃偶联形成C15-C16键,形成amphidinolide A的20元环。使用报道的结构 1 作为起点,制备了许多双环内酯 A 的非对映异构体。每个异构体中关键质子的化学位移相对于天然材料的偏差被用作确定相对立体化学中错误位置的指南。合成材料和天然材料的光谱数据非常吻合。
Asymmetric synthesis of a diastereomer of the structure proposed for amphidinolide A and the determination of its absolute configuration
An asymmetric synthesis of a diastereomer (2) of the structure (1) proposed for amphidinolide A, a cytotoxicmacrolide from the cultured dinoflagellateAmphidiniumsp., has been accomplished. The absolute configuration of amphidinolide A was established as 3 from comparison of NMR data, HPLC analysis, and [α]D values of amphidinolide A, and comparison with the synthetic diastereomers 2 and 3, the latter
非对映体(的不对称合成2的结构(的)1提出了用于amphidinolide A),从培养的藻细胞毒性大环内酯前沟藻。,已经完成。amphidinolide A的绝对构型确定为3从NMR数据的比较,HPLC分析,和[ α ] d amphidinolide A的值,并比较与合成非对映体2和3,其中后者是由特罗斯特的组预先合成。