Synthetic procedures are reported for the conversion of the Diels-Alder adduct of benzoquinone and both 1,3-cyclohexadiene and 1,3-cycloheptadiene to the parent hydrocarbons, 1,4-dihydro-1,4-ethanonaphthalene(benzobicyclo[2.2.2]octadiene) and 6,7,8,9-tetrahydro-5H-5,9-ethenobenzocycloheptene (benzobicyclo[3.2.2]nonadiene), respectively. The Diels-Alder adducts can be conveniently converted into the 5,8- and 1,4-dimethoxy as well as 5,8- and 1,4-diacetoxy derivatives, respectively, of these tricyclic compounds.
报告了苯醌与
1,3-环己二烯和
1,3-环庚二烯的 Diels-Alder 加合物转化为母体碳氢化合物、1,4-二氢-1,4-
乙腈基
萘(苯并双环[2.2.2]
辛二烯)和 6,7,8,9-四氢-5H-5,9-
乙烯基苯并
环庚烯(苯并双环[3.2.2]壬二烯)的合成过程。2.2]
辛二烯)和 6,7,8,9-四氢-5H-5,9-
乙烯基苯并
环庚烯(苯并双环[3.2.2]壬二烯)。Diels-Alder 加合物可方便地分别转化为这些
三环化合物的 5,8- 和 1,4- 二甲氧基以及 5,8- 和 1,4-
二乙酰氧基衍
生物。