Direct and Metal-Catalyzed Photochemical Dimerization of the Phthalide (<i>Z</i>)-Ligustilide Leading to Both [2 + 2] and [4 + 2] Cycloadducts: Application to Total Syntheses of Tokinolides A–C and Riligustilide
作者:Bingbing Sheng、Yen Vo、Ping Lan、Michael G. Gardiner、Martin G. Banwell、Pinghua Sun
DOI:10.1021/acs.orglett.9b02172
日期:2019.8.16
Synthetically derived (Z)-ligustilide (1) has been subjected to photochemically-promoted dimerization processes under a range of conditions. By such means, varying distributions of the dimeric natural products tokinolides A–C (4, 3, and 6, respectively) and riligustilide (5) as well certain related (isomeric) compounds have been obtained. The structures of three of them have been confirmed by single-crystal
合成衍生的 ( Z )-川芎内酯 ( 1 ) 在一系列条件下进行了光化学促进的二聚化过程。通过这种方式,改变二聚的天然产物tokinolides A-C(的分布4,3,和6,分别地)和riligustilide(5如已经获得很好某些相关的(异构体)的化合物)。其中三个的结构已通过单晶 X 射线分析得到证实。讨论了本研究结果的生物合成影响。