作者:Santiago Pérez-Rodríguez、Raquel Pereira-Cameselle、Ángel R. de Lera
DOI:10.1039/c2ob25874a
日期:——
The synthesis of dioxepine bastadin 3, a tyrosine–tyramine derivative with a dibenzo-1,3-dioxepine scaffold that is rarely present among natural products, is described. The dibenzo-1,3-dioxepine ring was formed early in the sequence and the (E)-2-(hydroxyimino)-N-alkylamide was generated in the last step by oxidation of the 2-amino-N-alkylamide precursor. The presumably biogenetic late-stage ring formation starting from congener bastadin 3 failed. A new synthesis of this alkaloid was also developed. This new route requires a minimal use of protecting groups and the order of the two key steps was reversed relative to the route to dioxepine bastadin 3.
本文描述了二氧杂环庚二烯 3 的合成过程,这是一种具有二苯并-1,3-二氧杂环庚二烯支架的酪氨酸-酪胺衍生物,在天然产物中很少出现。二苯并-1,3-二氧杂环是在整个过程的早期形成的,(E)-2-(羟基亚氨基)-N-烷基酰胺是在最后一步通过氧化 2-氨基-N-烷基酰胺前体生成的。从同系物韧皮部蛋白 3 开始的后期生物环形成可能失败。我们还开发出了这种生物碱的新合成方法。与二氧杂环庚二烯 3 的合成路线相比,这条新路线只需使用极少量的保护基团,而且两个关键步骤的顺序也颠倒了。