A Novel, Facile Approach to Frondosin B and 5-<i>epi</i>-Liphagal <i>via</i> a New [4 + 3]-Cycloaddition
作者:Jie Zhang、Liqi Li、Yongxiang Wang、Wenjing Wang、Jijun Xue、Ying Li
DOI:10.1021/ol3020013
日期:2012.9.7
A new [4 + 3]-cycloaddition between benzofuran allylicalcohols and dienes, promoted by camphorsulfonic acid, has been identified. A novel strategy which used this cycloaddition as a key step has been developed for the synthesis of 6,7,5-tricyclic skeleta, and syntheses toward frondosin B (1) and 5-epi-liphagal (2) have been achieved via short routes in good yields.
Total Synthesis of (+/−)-Frondosin B and (+/−)-5-<i>epi</i>-Liphagal by Using a Concise (4+3) Cycloaddition Approach
作者:Duchan R. Laplace、Bart Verbraeken、Kristof Van Hecke、Johan M. Winne
DOI:10.1002/chem.201303273
日期:2014.1.3
developed (4+3) cycloaddition between dienes and furfuryl alcohols, as precursors of oxyallyl‐type cations, has been used as a key step in the racemic syntheses of two natural products: frondosin B and liphagal. This work demonstrates the synthetic potential of this cycloaddition reaction, and offers a short synthetic route to an interesting family of natural products. A full account of these synthetic studies