Versatile synthesis of cadalene and iso-cadalene from himachalene mixtures: Evidence and application of unprecedented rearrangements
作者:Mustapha Ait El Had、Abdelouahd Oukhrib、Mohamed Zaki、Martine Urrutigoïty、Ahmed Benharref、Remi Chauvin
DOI:10.1016/j.cclet.2020.03.008
日期:2020.7
ar-himachalene intermediate using I2 and/or AlCl3 as reagents. The selectivity is shown to sharply depend on the operating conditions: while I2/AlCl3 in dichloromethane promotes the formation of cadalene, the formation of iso-cadalene is favored in the presence of AlCl3 in cyclohexane. The bicyclic aromatic compounds were thus obtained through unique rearrangements involving sequential C C bond cleavage/formation
摘要从阿特拉斯雪松(Cedrus atlantica)的废木材中提取的α-,β-和γ-喜马ale草混合物,卡达琳(1,6-二甲基-4-异丙基萘)和异二烯(1,6-二甲基-3) (I-异丙基萘)分两步生产,使用I2和/或AlCl3作为试剂,通过ar-himachalene中间体以最高71%±5%的产率生产。已显示出选择性极大地取决于操作条件:虽然二氯甲烷中的I2 / AlCl3促进了十八碳烯的形成,但在环己烷中存在AlCl3时,异-丙二烯的形成更为有利。因此,通过涉及顺序CC键裂解/形成和氢化物转移过程的独特重排获得了双环芳族化合物。在不存在AlCl3或I2的情况下,还发现以高达70%的选择性形成了二氢姜黄烯。