that of the bioactive conformation of paclitaxel and could be well accommodated within the proposed model. Accordingly, simplified Taxuspine U and X analogues have been rationally designed and their bicyclic 3,8-secotaxane diterpenoids intermediates have been synthesized through an approach that involves ring closing metathesis (RCM) as the key step for the macrocycle formation. Extensive studies on RCM
我们开发的关于
紫杉烷和微管蛋白之间相互作用的分子模型研究表明,修饰的
紫杉醇U和X可以采用类似于
紫杉醇生物活性构象的构象,并且可以很好地适应拟议的模型。因此,已经合理地设计了简化的红豆杉U和X类似物,并通过涉及环闭合复分解(RCM)作为大环形成关键步骤的方法合成了它们的双环3,8-癸四烯烷二
萜类中间体。已经使用
化学上多样化的底物对RCM进行了广泛的研究,概述了官能团的存在和位置,分子限制和闭环位点的重要性对大环化的影响。