Total Synthesis of Neohedycaryol. Its Possible Role in the Biosynthesis of Eudesmane Sesquiterpenes
作者:Adriaan J. Minnaard、Gerrit A. Stork、Joannes B. P. A. Wijnberg、Aede de Groot
DOI:10.1021/jo962056a
日期:1997.4.1
the germacrane sesquiterpene hedycaryol, was accomplished in 10 steps from the known dione 6. A Marshall fragmentation of the intermediate mesylate 14 was used to prepare the trans,trans-cyclodeca-1,6-diene ring present in neohedycaryol. During the synthesis of 14, a pronounced example of through-bond interactions (TBI) was observed. The preferred elongated chair conformation of neohedycaryol was demonstrated
从已知的二酮6开始,以十个步骤完成了新庚烷醇(4)的合成过程,即新庚烷倍半萜烯庚烷醇的C(9)-C(10)双键区域异构体。中间体甲磺酸酯14的马歇尔片段用于制备新庚烷中存在的反式,反式-环癸-1,6-二烯环。在合成14的过程中,观察到了一个贯穿键相互作用(TBI)的明显例子。在光谱学上和通过化学转化成α-,β-和γ-艾地摩尔的方式证明了新庚啶的优选的细长椅子构象。这些发现表明,如文献中所提出的,在新的表皮的合成中,新庚烷醇作为前体的出现是不可能的。新庚烷醇对细长的椅子构象的偏爱进一步表明该化合物占据内消旋形式。这意味着新庚啶醇可以作为实体和通常的阿联苯胺的生物合成中的前体。