Synthesis and Properties of Novel Oligothiophenes Surrounded by Bicyclo[2.2.2]octene Frameworks
作者:Atsushi Wakamiya、Daisuke Yamazaki、Tohru Nishinaga、Toshikazu Kitagawa、Koichi Komatsu
DOI:10.1021/jo034754i
日期:2003.10.1
Novel oligothiophenes surrounded by bicyclo[2.2.2]octene (abbreviated as BCO) frameworks ranging from dimer to hexamer, 1(nT) (n = 2, 3, 4, 6), were prepared, and their structures and electronic properties were investigated. Dimer 1(2T) was synthesized by oxidative coupling of the 2-lithiated monomer generated from 4,5-BCO-annelated 2-bromothiophene 8 with CuCl2 in 76% yield. Trimer 1(3T) and tetramer
制备了由二聚体到六聚体1(nT)(n = 2、3、4、6)的双环[2.2.2]辛烯(缩写为BCO)构架包围的新型低聚噻吩,并研究了它们的结构和电子性质。二聚体1(2T)是通过将4,5-BCO退火的2-溴噻吩8与CuCl2氧化生成的2-锂化单体以76%的收率合成的。三聚体1(3T)和四聚体1(4T)通过2,5-二溴-3,4-BCO退火的噻吩4和双(3,4-BCO的5,5'-二溴衍生物)的Stille偶联合成(2-噻吩-2-基)10与2-甲锡烷基化的4,5-BCO退火的噻吩9的产率分别为41%和46%。六聚体1(6T)是通过将对噻吩12与BCO单元进行三价退火氧化偶联而合成的,产率为81%。X射线晶体学研究表明,1(2T)和1(3T)中的噻吩环绕环间CC键旋转,其中C = CC = C二面角为-174.3(5)度,为1 (2T)和-149.7(3)度以及1(3T)的34.4(3)度。在1(2T