Derivatives of Natural Product Agrimophol as Disruptors of Intrabacterial pH Homeostasis in Mycobacterium tuberculosis
摘要:
This article reports the rational medicinal chemistry of a natural product, agrimophol (1), as a new disruptor of intrabacterial pH (pH(IB)) homeostasis in Mycobacterium tuberculosis (Mtb). Through the systematic investigation of the structure-activity relationship of 1, scaffold-hopping of the diphenylmethane scaffold, pharmacophore displacement strategies, and studies of the structure-metabolism relationship, a new derivative 5a was achieved. Compound 5a showed 100-fold increased potency in the ability to reduce pH(IB) to pH 6.0 and similarly improved mycobactericidal activity compared with 1 against both Mycobacterium bovis-BCG and Mtb. Compound 5a possessed improved metabolic stability in human liver microsomes and hepatocytes, lower cytotoxicity, higher selectivity index, and similar pK(a) value to natural 1. This study introduces a novel scaffold to an old drug, resulting in improved mycobactericidal activity through decreasing pH(IB), and may contribute to the critical search for new agents to overcome drug resistance and persistence in the treatment of tuberculosis.
Catalytic halogenation of selected organic compounds mimicking vanadate-dependent marine metalloenzymes
作者:Chimmanamada U. Dinesh、Rajiv Kumar、Bipin Pandey、Pradeep Kumar
DOI:10.1039/c39950000611
日期:——
The ammonium metavanadate, mimicking vanadate-dependent metalloenzymes, efficiently catalyses the halogenation of a variety of organic substrates in dilute conditions in moderate to good yields using dilute hydrogen peroxide (30%) as an oxidizing agent exhibiting remarkable ortho selectivity with electron-rich aromatics.
simple, efficient and mild method for the selective bromination of activated aromaticcompounds using ammonium bromide as the source of bromine and Oxone® as the oxidant in methanol or water as solvent is reported. The reaction proceeds at ambient temperature in yields ranging from moderate to excellent without a catalyst. bromination - aromaticcompounds - ammonium bromide - Oxone® - selectivity
[EN] ANTIGIARDIAL AGENTS AND USE THEREOF<br/>[FR] AGENTS ANTI-GIARDIASE ET LEUR UTILISATION
申请人:UNIV MISSISSIPPI
公开号:WO2004014886A1
公开(公告)日:2004-02-19
The present invention provides a method of preventing or treating one or more of the following medical conditions, or treating symptoms of one or more of the following medical conditions: amebic infections, giardiasis, estrogen deficient states, osteoporosis, cardiovascular heart disease, high cholesterol levels, hyperlipidemia, cancer by administering to a subject having, or predisposed to, one or more of the conditions, a therapeutically effective amount of a compound of the present invention and a pharmaceutically acceptable carrier.
The present invention provides a method of preventing or treating one or more of the following medical conditions, or treating symptoms of one or more of the following medical conditions: amebic infections, giardiasis, estrogen deficient states, osteoporosis, cardiovascular heart disease, high cholesterol levels, hyperlipidemia, cancer by administering to a subject having, or predisposed to, one or more of the conditions, a therapeutically effective amount of a compound of the present invention and a pharmaceutically acceptable carrier.