Staphylococcus aureus及Enterococcus faecalis,這兩類菌種對目前常使用的抗生素已產生抗藥性,造成醫學界莫大的困擾。研究發現,Guanacastepene A (1) 對於這兩類的病原體具有抗菌活性,因此開啟了Guanacastepene A (1) 的合成熱潮。 本論文研究以七環上的β- 甲基烯醇與雙烯支鏈反應,得到三烯化合物,再經由分子內的Diels-Alder反應形成六環,建構七、六駢環,得到Guanacastepene A (1) 的五、七、六駢環結構中的部分骨架。藉由修飾雙烯支鏈上的官能基,得到不同結構的七、六駢環。另外也研究雙鍵上的甲基取代對分子內Diels-Alder反應的影響。
Guanacastepene’s activity against methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus faecalis makes it of interest as a potential lead compound in the development of new antibacterial agents. We prepare trienyl compounds by combining side chain of the diene with 3-methylcyclohept-2-enol. We form the cyclohexane ring by an intramolecular Diels-Alder reaction, which has been used to form related [5, 4, 0]undecane. Now, we have the part of the carbon skeleton of Guanacastepene A. Finally, we study the influence of methyl group of dienophile on intramolecular Diels-Alder reaction