Chemistry of (+)-aromadendrene. Part 6: Rearrangement reactions of ledene, isoledene and their epoxides
作者:F.Javier Moreno-Dorado、Yvonne M.A.W Lamers、Grigore Mironov、Joannes B.P.A Wijnberg、Aede de Groot
DOI:10.1016/s0040-4020(03)01231-6
日期:2003.9
(−)-isoledene, both easily available from (+)-aromadendrene has been investigated. Reactions at the double bond of ledene take place preferably from the β-side. Under acidic conditions its C7–C8 β-epoxide and β-diol preferably react via carbocations, which are initially formed at C8. Rearrangement takes place to compounds with cubebane and cadinane skeletons. The reaction pattern of isoledene and its α-epoxide
已经研究了容易从(+)-aromadendrene获得的(+)-ledene和(-)-isoledene的化学性质。在二烯烃的双键处的反应优选从β侧发生。在酸性条件下,其C7–C8β-环氧化物和β-二醇优选通过碳阳离子反应,而碳阳离子最初在C8形成。重排发生在具有立方烷和卡丹烷骨架的化合物上。异戊二烯及其α-环氧化物在酸性条件下的反应方式受中间体α-环丙基羰基碳正离子容易形成的支配。进一步的反应导致产物中环丙烷环的C2-C3键断裂,得到具有愈创树骨架的化合物。胍型二烯和不饱和环状醚是这些重排的最终产物。已经制备了这些化合物的几种衍生物。