Synthesis of Ladder-Type π-Conjugated Heteroacenes via Palladium-Catalyzed Double N-Arylation and Intramolecular O-Arylation
作者:Keiko Kawaguchi、Koji Nakano、Kyoko Nozaki
DOI:10.1021/jo070427p
日期:2007.7.1
d‘]benzo[1,2-b:4,5-b‘]difurans, were effectively synthesized from the common intermediates, 2,5-bis(o-chloroaryl)hydroquinones. The key reactions are palladium-catalyzed double N-arylation of aniline and intramolecular O-arylation, which enable regioselective ring closure. In addition to the parent indolo[3,2-b]carbazole and dibenzo[d,d‘]benzo[1,2-b:4,5-b‘]difuran, their derivatives with an alkyl or cyano
可以有效地合成含有吡咯或呋喃环,吲哚并[3,2- b ]咔唑和二苯并[ d,d ']苯并[1,2- b:4,5- b ']二呋喃的阶梯型杂并苯中间体2,5-双(邻氯芳基)氢醌。关键反应是钯催化的苯胺双N-芳基化和分子内的O-芳基化,从而实现区域选择性的闭环。除了母体吲哚[3,2- b ]咔唑和二苯并[ d,d ']苯并[1,2- b:4,5- b首先合成了′]二呋喃,其具有烷基或氰基的衍生物。光物理和电化学研究表明,与相应的烃并苯,并五苯相比,所获得的杂苯具有较低的HOMO能级和较大的带隙。对二苯并[ d,d ']苯并[1,2- b:4,5- b ']二呋喃的X射线分析表明,其以人字形包装。