作者:Hang Cheng、Zhihong Zhang、Hongliang Yao、Wei Zhang、Jingxun Yu、Rongbiao Tong
DOI:10.1002/anie.201704628
日期:2017.7.24
alotane-type sesterterpenoids showed strikingly different biological activities and potency with subtle structural alterations. Asymmetric total syntheses of the tricyclic sesterterpenoids (−)-alotaketals A–D and (−)-phorbaketal A were accomplished [29–31 steps from (−)-malic acid] in a collective way for the first time. The key features of the strategy included 1) a new cascade cyclization of vinyl epoxy
新型的三环螺环烷酮-戊烷型酯类萜类化合物显示出显着不同的生物学活性和效力,并具有细微的结构改变。三环酯类化合物(-)-alotaketals A-D和(-)-phorbaketal A的不对称总合成是首次[集体从(-)-苹果酸] [29-31步]完成的。该策略的主要特征包括:1)对乙烯基环氧δ-酮醇进行新的级联环化,以形成常见的三环螺酮中间体; 2)后期烯丙基CH氧化; 3)烯烃交叉复分解安装不同的侧链。