Intermolecular Oxidative Annulation of 2-Aminoanthracenes to Diazaacenes and Aza[7]helicenes
作者:Kiyohiko Goto、Ryuichi Yamaguchi、Satoru Hiroto、Hiroshi Ueno、Tsuyoshi Kawai、Hiroshi Shinokubo
DOI:10.1002/anie.201204863
日期:2012.10.8
Which way to go: The product distribution in the efficient oxidation of 2‐aminoanthracene derivatives to pyrazine‐ and pyrrole‐fused bisanthracenes can be controlled by additives (see scheme; TFA=trifluoroacetic acid, DDQ=2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone). The pyrrole‐fused dimer can be regarded as an aza[7]helicene with a stable helical conformation.
走哪条路:可以通过添加剂控制2-氨基蒽衍生物有效氧化为吡嗪和吡咯稠合双蒽的产物分布(参见方案; TFA =三氟乙酸,DDQ = 2,3-二氯-5,6 -二氰基-1,4-苯醌)。吡咯稠合的二聚体可视为具有稳定螺旋构象的氮杂[7]螺旋烯。