Consecutive Application of the ?-Alkynone Cyclization: Total Synthesis of (�)-?9(12)-Capnellene
作者:Joan Huguet、Martin Karpf、Andr� S. Dreiding
DOI:10.1002/hlca.19820650806
日期:1982.12.15
The synthesis of the (±)-form of the marine sesquiterpene (–)-Δ9(12)-capnellene (1) by double application of the a-alkynone cyclization is described. Starting with 2, 2, 5-trim ethylcyclopentanone (2), the elaboration of the tricyclo [6.3.0.02,6]undecane C-skeleton of 1 proceeded through the a-alkynone 3, which was cyclized thermally to the bicyclo [3.3.0]octenone 4. For the anellation of the third
描述了通过两次应用α-炔酮环化反应合成海洋倍半萜(-)- Δ9(12) -capnellene(1)的形式。与2,2,5-修剪ethylcyclopentanone(起始2),三环的阐述[6.3.0.0 2,6 ]十一烷C-骨架的1通过进行一个-alkynone 3,将其加热环化生成的双环[3.3.1 0.0] octenone 4.对于第三五元环的anellation,4转化到一个-alkynone 5然后将后者热循环成角三苯醌6和直链三苯醌7的混合物。(± ) -Δ9(12) -capnellene(1)的合成最后步骤是由7用已知方法完成的。