Asymmetric Total Synthesis and Absolute Stereochemistry of the Neuroactive Marine Macrolide Palmyrolide A
作者:Rodolfo Tello-Aburto、Emily M. Johnson、Cheyenne K. Valdez、William A. Maio
DOI:10.1021/ol300673m
日期:2012.4.20
The firstasymmetric total synthesis and determination of the absoluteconfiguration for the neuroactive marine macrolide palmyrolide A is described. The highlight of the synthesis is macrocyclization via trans-enamide formation catalyzed by copper(I) iodide and cesium carbonate. Comparison with the authentic spectral data confirms the synthesis of (+)-ent-palmyrolide A.
描述了神经活性海洋大环内酯棕榈内酯 A 的第一次不对称全合成和绝对构型的确定。该合成的亮点是通过由碘化铜 (I) 和碳酸铯催化的反式烯酰胺形成进行大环化。与真实光谱数据的比较证实了 (+)- ent- palmyrolide A的合成。
Stereoselective total synthesis of palmyrolide A via intramolecular trans N-methyl enamide formation
The stereoselective total synthesis of palmyrolide A was accomplished through macrocyclization reaction involving trans enamide formation by coupling of vinyl iodide with secondary amide in an intramolecular fashion. The two coupling partners, vinyl iodide 4 and secondary amide 3 were synthesized from the same intermediate alcohol 5. Yamaguchi esterification and CBS-reduction are the other key steps