A Stereodivergent Synthesis of All Stereoisomers of Centrolobine: Control of Selectivity by a Protecting-Group Manipulation
作者:Bernd Schmidt、Frank Hölter
DOI:10.1002/chem.200902053
日期:2009.11.9
All stereoisomers of the natural product centrolobine are selectively synthesized, by starting from a common precursor. Key steps are an enantioselective allylation with enantiomerically pure allylsilanes, a tandem ring‐closing metathesis–isomerization reaction, and a Heck reaction by using an arene diazonium salt. By choosing appropriate conditions for the final deprotection step, either the cis‐configured
天然产物中心洛宾的所有立体异构体是通过共同的前体开始选择性合成的。关键步骤是与对映体纯的烯丙基硅烷进行对映选择性烯丙基化,串联闭环复分解-异构化反应以及使用芳烃重氮盐进行的Heck反应。通过为最终的脱保护步骤选择合适的条件,可以有选择地获得顺式构型的中心球蛋白或其差向异构体。