Convenient ()-ethylidenecyclopentane annulation sequences. Total synthesis of (±)-oplopanone, (±)-8--oplopanone, and (±)-anhydro-oplopanone
作者:Edward Piers、Ashvinikumar V. Gavai
DOI:10.1016/s0040-4039(00)84005-8
日期:1986.1
enones 9, 12–17, followed by base-promoted intramolecular alkylation of the resultant products, gives the (Z)-ethylidenecyclopentane annulation products 11, 18–23, respectively. This new annulation method is applied to the total synthesis of the opiopanane-type sesquiterpenoids 27, 28, and 38.
将格氏试剂8的[四氢呋喃(THF)-Et 2 O,CuBr·Me 2 S,BF 3 ·Et 2 O,-78°C]共轭添加到烯酮9、12-17中,然后进行碱促进的分子内烷基化所得产物,分别得到(Z)-亚乙基环戊烷环化产物11、18-23。这种新的环化方法适用于鸦片烷型倍半萜类化合物27、28和38的全合成。