作者:Heiner Ebel、Sebastian Knör、Wolfgang Steglich
DOI:10.1016/s0040-4020(02)01451-5
日期:2003.1
A synthesis of (+)-calopin (1a) was achieved employing a highly stereoselective ene reaction between 8-phenylmenthyl glyoxylate (3) and the β,β-dimethylstyrene 4c. Transesterification of the resulting homoallylic alcohol 5c, followed by allylic oxidation and hydrogenation yielded the δ-lactone 13 which was deprotected to the natural product 1a.
合成(+)-calopin(1a)是通过8-苯基薄荷基乙醛酸酯(3)和β,β-二甲基苯乙烯4c之间的高度立体选择性烯反应实现的。所得均丙醇5c的酯交换反应,然后进行烯丙基氧化和氢化,得到δ-内酯13,其被脱保护为天然产物1a。