作者:Christopher W. am Ende、Zhou Zhou、Kathlyn A. Parker
DOI:10.1021/ja3108577
日期:2013.1.16
completed in 14 steps (longest linear sequence) from commercially available starting materials. The doubly convergent route employs a tandem 5-exo, 6-exo radical cyclization as the key step. This reaction assembles the fully functionalized tetracyclic core and introduces three stereogenic centers. Other effective transformations are the regioselective deoxygenation of an advanced enone intermediate and
新型角鲨烯合酶抑制剂 bisabosqual A 的合成是通过 14 个步骤(最长的线性序列)从市售起始材料完成的。双收敛路线采用串联5-exo、6-exo自由基环化作为关键步骤。该反应组装了完全功能化的四环核心并引入了三个立体中心。其他有效的转化是高级烯酮中间体的区域选择性脱氧以及在酯存在下将三甲基铝化学和非对映选择性加成到酮上。