The biomimetic synthesis of SNF4435C and SNF4435D, and the total synthesis of the polyene metabolites aureothin, N-acetyl-aureothamine and spectinabilin
作者:Mikkel F. Jacobsen、John E. Moses、Robert M. Adlington、Jack E. Baldwin
DOI:10.1016/j.tet.2005.11.058
日期:2006.2
(±)-N-acetyl-aureothamine (4) and (±)-spectinabilin (5) are presented. The key steps in the synthesis of (±)-3, (±)-4 and (±)-5 are the construction of the tetrahydrofuran motif using a palladium-catalyzed cycloaddition and the ruthenium-catalyzed cross metathesis of alkene 17 to form the common intermediate, boronic ester 24, which was further transformed using a trans-selective Suzuki coupling with a
据报道,通过级联的E / Z异构化和电环化,多烯代谢物spectinabilin(5)仿生转化为异构体天然产物SNF4435C(1)和SNF4435D(2)的完整细节。另外,提出了相关天然产物(±)-金黄色素(3),(±)-N-乙酰基-金黄色胺(4)和(±)-Spectinabilin(5)的短的总合成物。合成(±)-3,(±)-4和(±)-5的关键步骤是使用钯催化的环加成反应和烯烃催化的钌催化的交叉易位烯烃17形成四氢呋喃基序以形成常见的中间体硼酸酯24的方法,该方法可通过使用反选择性的Suzuki偶联,二溴化物和立体异构体进一步转化Negishi型甲基化。