Synthesis and nitration of some thieno-fused analogues of the benzo[<i>a</i>]quinolizinium cation
作者:Kiyoshi Sato、Sadao Arai、Takamichi Yamagishi
DOI:10.1002/jhet.5570330111
日期:1996.1
Three thieno-fused analogues of benzo[a]quinolizinium (1), thieno[3,2-a]- and thieno[2,3-a]quinolizinium 4 and 5 and thiazolo[2,3-a]isoquinolinium (6), were synthesized by photocyclization of 1-(2-thienylvinyl)pyridinium salts 9a and 9b and 3-styrylthiazolium salt 9c, respectively. The nitration of the compounds 4, 5, and 6 occurred predominantly at positions 2, 3, and 7, respectively, while the nitro
苯并[ a ]喹啉鎓(1),噻吩并[3,2- a ]-和噻吩并[2,3- a ]喹啉鎓4和5和噻唑并[2,3- a ]异喹啉鎓(6)的三种硫醇稠合类似物分别通过1-(2-噻吩基乙烯基)吡啶鎓盐9a和9b以及3-苯乙烯基噻唑鎓盐9c的光环化合成α ,β ,β-和β- 。的硝化化合物4,5,和6分别在2位,3主要发生,和7,而将硝基引入到8位和10位1以68:32的比例。还比较了母体化合物1的nmr和uv光谱特性以及4–6的还原电位。