Su Kuan-Jen, Mieusset Jean-Luc, Arion Vladimir B, Brecker Lothar, Brinker Udo H
Institut für Organische Chemie, Universität Wien, Währinger Strasse 38, A-1090 Wien, Austria.
Org Lett. 2007 Jan 4;9(1):113-5. doi: 10.1021/ol0626793.
[reaction: see text] A reinvestigation of the thermolysis of 4,4-dibromotetracyclo[6.2.1.0(2,7).0(3,5)]undec-9-ene (2) affords diene 8 with a completely rearranged hydrocarbon skeleton via the isolable intermediate 4, along with cyclopentadiene and bromobenzene. DFT calculations show that the novel tandem retro-Diels-Alder-Diels-Alder reaction with role reversal is slightly less favored than the overall single-step Cope rearrangement.
[反应:见正文] 对4,4-二溴四环[6.2.1.0(2,7).0(3,5)]十一碳-9-烯(2)热解反应的重新研究表明,通过可分离的中间体4可得到具有完全重排碳氢骨架的二烯8,同时还生成环戊二烯和溴苯。密度泛函理论计算表明,这种具有角色反转的新型串联逆狄尔斯-阿尔德-狄尔斯-阿尔德反应比整体的单步科普重排反应略不利。