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