Chemistry of the Pyrrolo[1,2-<i>a</i>]benzimidazole Antitumor Agents: Influence of the 7-Substituent on the Ability To Alkylate DNA and Inhibit Topoisomerase II
作者:Ru Zhou、Edward B. Skibo
DOI:10.1021/jm960064d
日期:1996.1.1
aziridinyl ring. The 7-substituent controls the fate of the aziridinyl ring by means of steric and electronic effects. An electron-rich 7-substituent favors the 1,5-sigmatropic shift reaction. If the 7-substituent distorts the 6-aziridinyl group from the conformation required for the 1,5-sigmatropic shift, then nucleophile trapping occurs. The 7-methyl substituent results in significant nucleophilic