Synthesis and Antiplasmodial Activity of Aminoalkylamino-Substituted Neocryptolepine Derivatives
摘要:
A series of chloro- and aminoalkylamino-substituted neocryptolepine (5-methyl-5H-indolo[2,3-b]quinoline) derivatives were synthesized and evaluated as antiplasmodial agents. The evaluation also included cytotoxicity (MRCS cells), inhibition of beta-hematin formation, and DNA interactions (DNA-methyl green assay). Introduction of aminoalkylamino chains increased the antiplasmodial activity of the neocryptolepine core substantially. The most efficient compounds showed antiplasmodial activities in the nanomolar range. N-1,N-1-Diethyl-N-4-(5-methyl-5H-indolo[2,3-b]quinolin-8-yl)pentane-1,4-diamine 11c showed an IC50 of 0.01 mu M and a selectivity index of 1800.
Here, we report the copper-catalyzed C2 selective cross-dehydrogenative C-N bond formation of azines with azoles. This straightforward method enables us to address the key limitation of prior N-O activation strategy in C2 amination of azines. The wide substrate scope, high functional group tolerance, and ease of operation of the present method are expected to promote its potential application in synthetic chemistry.