Total Synthesis of (+)-Cephalosporolide E and (-)-Cephalosporolide F en route to Bassianolone
作者:Rodney Fernandes、Arun Ingle
DOI:10.1055/s-0029-1218538
日期:2010.1
A stereoselective synthesis of (+)-cephalosporolide E and (―)-cephalosporolide F en route to bassianolone is described. The key steps involve cross metathesis to get the desired β,γ-unsaturated ester, asymmetric dihydroxylation to install the β-hydroxy-γ-lactone moiety and spiroketalization. Although attempts to get free bassianolone failed, the first total synthesis of natural cephalosporolides E
描述了 (+)-头孢菌素 E 和 (-)-头孢菌素 F 的立体选择性合成,用于制备bassianolone。关键步骤包括交叉复分解以获得所需的 β,γ-不饱和酯、不对称二羟基化以安装 β-羟基-γ-内酯部分和螺酮化。尽管获得游离bassianolone的尝试失败了,但天然头孢菌素E和F的首次全合成已通过九步完成,总产率分别为6.3%和3.5%。