A Novel Ring-closure Reaction between 1,4-Dihydroxyanthraquinone and Diamines Promoted by Copper Ions
作者:Toshio Takei、Masaru Matsuoka、Teijiro Kitao
DOI:10.1246/bcsj.54.2735
日期:1981.9
2-cyclohexanediamine afforded the ring-closure products, 6-hydroxy-1,2,3,4-tetrahydronaphtho[2,3-f]quinoxaline-7,12-dione derivatives, in good yields of 70–98%. On the other hand, in the cases of N-alkylethylenediamines or 2-(alkylamino)ethanols, the major products were the 2-aminated 1,4-dihydroxyanthraquinones. The direct 2-amination of 1 was greatly inhibited when an alkyl group was introduced to the amino
1,4-二羟基蒽醌(DHAQ, 1)与各种二胺的反应在CuCl2存在下进行。伯 1,2-乙二胺或 1,2-环己二胺提供闭环产物 6-羟基-1,2,3,4-四氢萘并[2,3-f]喹喔啉-7,12-二酮衍生物,良好产率为 70-98%。另一方面,在 N-烷基乙二胺或 2-(烷基氨基)乙醇的情况下,主要产物是 2-胺化的 1,4-二羟基蒽醌。当烷基被引入氨基时,1 的直接 2-氨基化被极大地抑制,因为它的空间要求。研究了铜离子的作用、胺的 N-烷基取代基的空间要求的影响以及链烷二胺链长对 1 与胺反应的影响。