An efficient, high-yielding strategy has been developed for the asymmetric total synthesis of seven norditerpenoid dilactones known for their diverse biological properties. The three key steps employed to obtain a tricyclic lactone intermediate involved a Morita−Baylis−Hillman reaction, the stereocontrolled construction of a γ-lactone through bromolactonization, and an efficient catalytic Reformatsky-type
已经开发出一种有效,高产的策略,可以不对称地合成七个以其多种
生物学特性而闻名的降
冰片萜二内酯。用于获得
三环内酯中间体的三个关键步骤涉及Morita-Baylis-Hillman反应,通过
溴内酯化立体控制γ-内酯的构建以及有效的催化Reformatsky型反应。可以从一个常见的中间体中获得CJ-14,445,LL-Z1271γ,oidiolactones A,B,C和D以及
萘基内酯F。通过X射线分析确定结构和立体
化学。