Photoinduced electron transfer reaction of mono- and dicyanonaphthalenes with allyltrimethylsilane: Synthesis of benzotricyclo[4.2.1.03,8]nonenes by reductive photoallylation and intramolecular (2π+2π) photocycloaddition
作者:Toshinori Nishiyama、Kazuhiko Mizuno、Yoshio Otsuji、Hiroo Inoue
DOI:10.1016/0040-4020(95)00326-4
日期:1995.6
photoinduced electron transfer from 1 to the excited singlet states of mono- and dicyanonaphthalenes. The reductive allylation products from the former cyanonaphthalenes afforded the benzotricyclic compounds by an intramolecular (2π+2π) photocycloaddition in good yields. The regioselectivity in the allylation reaction is discussed on the basis of the results of MO calculations of the radical anions of mono-
通过派热克斯滤光片(> 280 nm)辐照含有1-氰基萘和烯丙基三甲基硅烷(1)的乙腈-甲醇(4:1)溶液,区域选择性地产生3-氰基-4,5-苯并三环[4.2.1.0 3,8] -4-壬烯。2-氰基萘,1-氰基-2-甲基萘,1-氰基-4-甲基萘,1,5-和2,3-二氰基萘与1的光反应也以区域选择性的方式得到了相应的苯并三环化合物。然而,2,3-二取代的1,4-二氰基萘与1的光反应没有得到苯并三环化合物,而只得到了烯丙基取代和还原性烯丙基化产物。这些光反应是通过从1到单氰基和双氰基萘的激发单重态的光诱导电子转移引发的。从得到benzotricyclic化合物前者cyanonaphthalenes还原烯丙基化产物通过分子内(2 π 2 π)进行光环加成,收率良好。基于对单氰基和双氰基萘的自由基阴离子的MO计算结果,讨论了烯丙基化反应中的区域选择性。