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.