Studies on methoxylation in the 7<i>H</i>-naphtho[1,2,3-<i>I,j</i>][2,7]naphthyridin-7-one system
作者:Jordan K. Zjawiony、Ashraf A. Kbalil、Alice M. Clark、Charles D. Hufford、John K. Buolamwini
DOI:10.1002/jhet.5570340422
日期:1997.7
found that regioselectivity of nucleophilic substitution in the sampangine system can be directed by reaction conditions. Under kinetic control (lower temperatures) substitution at C-4 is the predominant reaction, regardless of whether 3-bromo or 4-bromosampangine were used. At higher temperatures, when the reaction is thermodynamically controlled, substitution of the bromine atom at C-3 predominates
描述了以3-溴-和4-溴三聚精胺为代表的7H-萘[1,2,3- i,j ] [2,7]萘甲七-1-酮(三聚精)系统中的甲氧基化研究。。我们已经发现,可以通过反应条件来指导在sampangine系统中亲核取代的区域选择性。在动力学控制下(较低的温度),无论使用3-溴还是4-溴三聚精氨酸,在C-4处的取代都是主要反应。在更高的温度下,当通过热力学控制反应时,C-3处的溴原子取代占主导地位。这是第一个报道的7 H-萘[1,2,3- i,j ] [2,7]萘啶-7-一系统的环A中亲核取代的例子。