Synthesis of (±)-likonide B (smenochromene D) using a regioselective Claisen rearrangement, separation of the enantiomers and stereochemical assignment
作者:Marjorie Bruder、Stephen J. Smith、Alexander J. Blake、Christopher J. Moody
DOI:10.1039/b901358j
日期:——
A synthesis of the unusual ansa-bridged farnesyl hydroquinone derivative likonide B in racemic form is described. The natural product, also known as smenochromene D, was obtained from geranylacetone by a route in which the key steps are a regioselective microwave-mediated Claisen rearrangement of an aryl propargyl ether to deliver the chromene ring, and macrocyclization via an intramolecular Mitsunobu
描述了外消旋形式的不寻常的ansa-桥连的法呢基对苯二酚衍生物柠檬苦素B的合成。天然产物,也称为smenochromene D,得自香叶基丙酮通过其中关键步骤是芳基炔丙基醚的区域选择性微波介导的克莱森重排以递送色烯环的途径,以及通过分子内的Mitsunobu反应进行大环化。随后在手性固定相上进行HPLC,得到纯净的(+)-和(-)-对映体,通过CD光谱法进行了研究,从而为两种天然产物(-)-smenochromene D和( +)-利康奈德B.