Antineoplastic Agents. 552. Oxidation of Combretastatin A-1: Trapping the o-Quinone Intermediate Considered the Metabolic Product of the Corresponding Phosphate Prodrug
摘要:
The very unstable (<10 min at rt) o-quinone 5 derived from the vicinal diphenol anticancer drug combretastatin A-1 (1) has been obtained by careful oxidation with NaIO4 and tetrabutylammonium bromide in water/dichloromethane. Immediate reaction with phenylenediamine (6) allowed o-quinone 5 to be trapped as the stable phenazine derivative 7. For further confirmation, 5 was also captured as a dimethoxyphenylenediamine-derived phenazine (11). Both phenazines 7 and 11 significantly inhibited (ED50 similar to 0.2 mu g/mL) growth of the murine P388 lymphocytic leukemia cell line and provided a new SAR insight in the combretastatin series of naturally occurring anticancer drugs.
Antineoplastic Agents. 552. Oxidation of Combretastatin A-1: Trapping the <i>o</i>-Quinone Intermediate Considered the Metabolic Product of the Corresponding Phosphate Prodrug
作者:George R. Pettit、Andrew J. Thornhill、Bryan R. Moser、Fiona Hogan
DOI:10.1021/np800179g
日期:2008.9.1
The very unstable (<10 min at rt) o-quinone 5 derived from the vicinal diphenol anticancer drug combretastatin A-1 (1) has been obtained by careful oxidation with NaIO4 and tetrabutylammonium bromide in water/dichloromethane. Immediate reaction with phenylenediamine (6) allowed o-quinone 5 to be trapped as the stable phenazine derivative 7. For further confirmation, 5 was also captured as a dimethoxyphenylenediamine-derived phenazine (11). Both phenazines 7 and 11 significantly inhibited (ED50 similar to 0.2 mu g/mL) growth of the murine P388 lymphocytic leukemia cell line and provided a new SAR insight in the combretastatin series of naturally occurring anticancer drugs.