Thiolates Chemically Induce Redox Activation of BTZ043 and Related Potent Nitroaromatic Anti-Tuberculosis Agents
作者:Rohit Tiwari、Garrett C. Moraski、Viktor Krchňák、Patricia A. Miller、Mariangelli Colon-Martinez、Eliza Herrero、Allen G. Oliver、Marvin J. Miller
DOI:10.1021/ja311058q
日期:2013.3.6
nitro groups present in these compounds to the corresponding nitroso intermediates by addition at the unsubstituted electron-deficient aromatic carbon present in these compounds. Furthermore, we demonstrate here that these compounds are good candidates for the classical von Richter reaction. These chemical studies offer an alternate hypothesis for the mechanism of action of nitroaromatic anti-TB agents
Substituted nitrobenzothiazinones (BTZs) are potent antituberculosis prodrugs that are reductively activated to produce nitroso moieties that form covalent adducts with a cysteine residue of decaprenylphosphoryl-β-D-ribose-2'-oxi-dase (DprE1) of Mycobacterium tuberculosis (Mtb). The resulting cell wall synthesis inhibition is lethal to Mtb, leading to consideration of development of BTZs for clinical use. The hydride-induced reduction of the nitroaromatic proceeds by reversible formation of the corresponding Meisenheimer complex. Herein we demonstrate that chemical reduction of BTZ043 with NaBD4 followed by reoxidation incorporates deuterium into the core nitro aromatic warhead. Subsequent reduction of the deuterated species is not affected, but, as expected, reoxidation is slowed by the deuterium isotope effect, thus prolonging the lifetime of the active nitroso oxidation state.
Substituted nitrobenzothiazinones (BTZs) are potent antituberculosis prodrugs that are reductively activated to produce nitroso moieties that form covalent adducts with a cysteine residue of decaprenylphospholyl-β-D-ribose-2′-oxi-dase (DprE1) of
Mycobacterium tuberculosis
(Mtb). The resulting cell wall synthesis inhibition is lethal to Mtb, leading to consideration of development of BTZs for clinical use. The hydride-induced reduction of the nitroaromatic proceeds by reversible formation of the corresponding Meisenheimer complex. Herein we demonstrate that chemical reduction of BTZ043 with NaBD4 followed by reoxidation incorporates deuterium into the core nitro aromatic warhead. Subsequent reduction of the deuterated species is not affected, but, as expected, reoxidation is slowed by the deuterium isotope effect, thus prolonging the lifetime of the active nitroso oxidation state.