has been achieved. The core macrocycle was made via a dual macrolactonization/pyran hemiketal formation reaction, developed to circumvent issues related to the reversible nature of acylketene formation from β-keto lactone substrates. Initial approaches to the core of the natural product that revolved around ring-closing metathesis (RCM) and relay ring-closing metathesis (RRCM) reactions are also described
(-)-callipeltoside A ( 1 )的全合成已经实现。核心大环是通过双重大环内酯化/
吡喃半
缩酮形成反应制成的,开发该反应是为了避免与 β-酮内酯底物形成酰基烯酮的可逆性质相关的问题。还描述了围绕闭环复分解 (RCM) 和中继闭环复分解 (RRCM) 反应的
天然产物核心的初步方法。