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 allylic alcohols 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.
已经确定了由樟脑磺酸促进的苯并呋喃烯丙基醇和二烯之间的新的[4 + 3]-环加成反应。已经开发出一种新的策略,以该环加成反应为关键步骤,用于合成6,7,5-三环skeleta,并已通过短途径实现了对frondosin B(1)和5- epi- liphagal(2)的合成。丰产。