Synthesis of 1-functionalized-6-hydroxy-4-methyl and 6,11-dihydroxy-4-methylnaphtho[2,3-<i>g</i>]isoquinoline-5,12-quinones
作者:Martine Croisy-Delcey、Emile Bisagni、Christiane Huel、Danielle Zilberfarb、Alain Croisy
DOI:10.1002/jhet.5570280112
日期:1991.1
Diels-Alder condensation of the former compound with homophthalic anhydride (22) led to a mixture of the two possible isomers: 1-chloro-11-hydroxy-4-methylnaphtho[2,3-g]isoquinoline-5,12-quinone (23) and 1-chloro-6-hydroxy-4-methylnaphtho[2,3-g]isoquinoline-5,12-quinone (24), this last tetracyclic chloroquinone was specifically obtained from 6-bromo-1-chloro-4-methylisoquinoline-5,8-quinone (7) and homophthalic
以2-甲氧基和2,5-二甲氧基苯乙酮8a和8b为起始原料,通过多步序列获得了1-氯-4-甲基异喹啉-5,8-醌(6)及其6-溴衍生物7 。前一种化合物与高邻苯二甲酸酐的Diels-Alder缩合反应(22)导致两种可能的异构体的混合物:1-氯-11-羟基-4-甲基萘[2,3- g ]异喹啉-5,12-醌(23)和1-氯-6-羟基-4-甲基萘[2,3- g ]异喹啉-5,12-醌(24),该最后的四环氯醌具体地是从6-溴-1-氯-4获得的。 -甲基异喹啉-5,8-醌(7)和高邻苯二甲酸酐。然后,通过硝酸铵氧化或通过苯并环丁烯二酮(28)和1-氯-4-甲基异喹啉-5,8-醌(6)的环加成,通过光化学法制备6,11-二羟基衍生物。氯化合物很容易被二胺取代,从而提供相应的1-氨基取代的羟基四环醌。