The 7,8-epoxy-2,3,5,6-tetrakis(methylene) bicyclo[2.2.2]octane; synthesis and diels-alder reactivity
作者:Raphy Gabioud、Pierre Vogel
DOI:10.1016/0040-4020(80)85037-x
日期:1980.1
transannular interaction between the homoconjugated s-cis-butadiene functions in 5 is found in the UV absorption spectrum. The Diels-Alder addition of 5 to tetracyanoethylene (TCE) is syn-regioselective and leads to the monoaducts 16:17 (85:15). The dienes 16,17 are less reactive than 5 toward TCE. anti-regioselectivity (leading to exo-2, endo-3-bis(chloromethyl)-5,6-bis(methylene)-syn-7,8-epoxybicyclo[2
描述了7,8-环氧-2,3,5,6-四(亚甲基)双环[2,2,2]辛烷(5)的制备。在紫外线吸收光谱中发现了5中的同构共轭s-顺式-丁二烯官能团之间的跨环相互作用的证据。在四氰基乙烯(TCE)中,狄尔斯-阿尔德(Diels-Alder)加成5是顺-区域选择性的,并导致单加合物16:17(85:15)。二烯16,17对TCE的反应性小于5。抗-regioselectivity(导致外-2,内-3-二(氯甲基)-5,6-双(亚甲基) -顺式-7,8- epoxybicyclo [2.2.2]八度(25)在HCl的双重消除观察从顺-7,8-环氧外型-2,内切-3,外-5,内切-6-四(氯甲基)二环[2.2.2]辛烷(11) ,5的前身。区域异构体16,17的结构在光谱和化学上得到确认。在DMF中,CsF可以诱导从26个氯甲基中的HCl (25的TCE加合物)和TCE加合物16、17和26中的HCN消除。