Synthesis of Dibenzo[c,h][1,6]naphthyridine, [2]Benzopyrano[4,3-c]quinoline and Benzo[i]phenanthridine Analogues of the Quaternary Benzo[c]phenanthridines
作者:Susan M. Hutton、Simon Paul Mackay、Otto Meth-Cohn
DOI:10.1055/s-2000-6325
日期:——
Three concise syntheses of the dibenzo[c,h][1,6]naphthyridines, [2]benzopyrano[4,3-c]quinolines and the benzo[i]phenanthridines are reported. All methods involve Vilsmeier chemistry, either to generate a 12-methyl-6-oxo-6H-[2]benzopyrano[4,3-c]quinolinium salt which after hydrolysis with either ammonia or methanol can ultimately be cyclised to the first two target compounds, whereas the latter can be prepared in one step from 2-(1-pyrrolidino)-3,4-dihydronaphthalene and N-methylformanilide in phosphorus oxychloride. These tetracyclic heteroaromatic ring systems are related to the benzo[c]phenanthridines, and form part of our investigations into determining the mechanism of action of this class of compounds as topoisomerase inhibitors.
报告了三种二苯并[c,h][1,6]萘啶、[2]苯并吡喃并[4,3-c]喹啉和苯并[i]菲啶的简明合成方法。所有方法都涉及维尔斯梅尔化学,或生成 12-甲基-6-氧代-6H-[2]苯并吡喃并[4,3-c]喹啉鎓盐,该鎓盐与氨或甲醇水解后,最终可环化为前两种目标化合物,而后者可在氧氯化磷中由 2-(1-吡咯烷基)-3,4-二氢萘和 N-甲基甲酰苯胺一步制备。这些四环杂芳香环系统与苯并[c]菲啶类化合物有关,是我们研究确定这类化合物作为拓扑异构酶抑制剂的作用机制的一部分。