Novel Stereocontrolled Approach tosyn- andanti-Oxepene–Cyclogeranyltrans-Fused Polycyclic Systems: Asymmetric Total Synthesis of (−)-Aplysistatin, (+)-Palisadin A, (+)-Palisadin B, (+)-12-Hydroxy-Palisadin B, and the AB Ring System of Adociasulfate-2 and Toxicol A
作者:Elias A. Couladouros、Veroniki P. Vidali
DOI:10.1002/chem.200400407
日期:2004.8.6
the construction of trans-syn 6,7-ring systems. This approach leads to the synthesis of the AB fragment of Adociasulfate-2 and Toxicol A, for the first time. The flexibility and efficiency of the presented strategy is demonstrated by the total asymmetric synthesis of (-)-Aplysistatin, (+)-Palisadin A, (+)-12-hydroxy-Palisadin B, and (+)-Palisadin B, employing two similar key intermediates.
描述了一种新的立体控制方法,用于形成反式反环香叶基-氧杂环戊烯系统。苛刻的立体化学可通过环香叶基叔醇与1,2-不对称取代的环氧化物的立体选择性偶联来确保,同时通过闭环复分解反应可实现高应力环氧丙烷的形成。由于反式稠合的6,7-环系统的立体化学是由环氧化物确定的,因此该方法还允许构造反式-顺式6,7-环系统。这种方法首次合成了Adociasulfate-2和Toxicol A的AB片段。所提出策略的灵活性和效率通过(-)-Aplysistatin,(+)-Palisadin A,(+)-12-羟基-Palisadin B和(+)-Palisadin B的完全不对称合成得到证明,