structurally unique, caryophyllene-type sesquiterpene which has shown immunosuppressive activity and cytotoxicity in preliminary assays. A stereocontrolled approach to the functionalised 2-oxabicyclo[3.2.0]-heptane core of pestalotiopsin A is described. This constitutes the first synthetic studies on pestalotiopsin A. Our approach includes a samarium(II)-mediated 4-exo-trig cyclisation and a trans-lactonisation
骨视蛋白A是一种结构独特的,
石竹烯型
倍半萜,在初步试验中显示出免疫抑制活性和细胞毒性。描述了一种立体控制的方法来合成鼠疫视蛋白A的2-氧杂双环[3.2.0]-
庚烷核心。这构成了对瘟疫菌素A的首次合成研究。我们的方法包括includes(II)介导的4-exo-trig环化和通过向
环丁酮中间体中添加烷基y试剂而引发的反式内酯化过程。进一步的操作提供了进入高级中间体的途径,这些中间体是未来构建靶最终环的极好前体。