Photochemical reactions of 1,4-dicyanonaphthalene with allylic silanes: control of reaction modes by use of solvent and additive effects
作者:Kazuhiko Mizuno、Toshinori Nishiyama、Kiyotaro Terasaka、Masahide Yasuda、Kensuke Shima、Yoshio Otsuji
DOI:10.1016/s0040-4020(01)81184-4
日期:——
Solvent and additive effects on the photoreaction of 1,4-dicyanonaphthalene, (1,4-DCN) with allylic silanes (1a–c) have been investigated. Irradiation of acetonitrile solutions containing 1,4-DCN and 1a–c in the presence of NaOMe selectively afforded the substitution products 1-(2′-alkenyl)-4-cyanonaphthalenes (2a–c) in high yields. The photoreaction of1,4-DCN with 1a–c in the presence of pyrene in
研究了溶剂和添加剂对1,4-二氰基萘(1,4-DCN)与烯丙基硅烷(1a–c)的光反应的影响。在NaOMe的存在下,辐照含有1,4-DCN和1a-c的乙腈溶液,可以高收率选择性地提供取代产物1-(2'-烯基)-4-氰基萘(2a-c)。在CH 3 CN-MeOH(4:1)中,在of存在下1,4-DCN与1a–c的光反应选择性地提供了加成产物1-(2'-烯基)-1,4-二氰基-1,2 -二氢萘(3a–c,3c')高产。CH 3中菲存在下1,4-DCN与1a-c的光反应CN-MeOH(4:1)提供三环化合物3,6-dicyano-4,5-苯并三环-[4.2.1.0 3,8 ] -4-壬烯(4a–c,4c')和5b(4b),这是通过3a–c和2c'的分子内(3π+2π)光环加成反应产生的。讨论了这些光反应的机理。