A novel synthesis of thienamycin is described. The crucial step of the synthesis is based on Cu(I)-mediated Kinugasa cycloaddition/rearrangement cascade reaction between terminal acetylene derived from D-lactic acid and suitable, partially protected, five-membered cyclic nitrone obtained from 2-deoxy-D-ribose. The reaction was performed in the presence of tetramethylguanidine as a base to provide 5
描述了一种新的
硫霉素合成方法。合成的关键步骤基于衍生自D-
乳酸的末端
乙炔与由
2-脱氧-D-核糖制得的合适的,部分受保护的五元环硝酮之间的Cu(I)介导的Kinugasa环加成/重排级联反应。 。该反应在
四甲基胍作为碱的存在下进行,以提供5,6-反式取代的碳青霉烯为主要产物。然后,将如此获得的在氮杂
环丁酮环上具有(5R,6S)构型的碳青霉烯11进行氧化/脱保护/氧化反应序列,得到β-
酮酯20,将其直接转化为
噻吩霉素的N,O-保护的甲基酯。