Structural Optimization of Antimycobacterial Azaaurones Towards Improved Solubility and Metabolic Stability

Author:

Campaniço André1ORCID,Harjivan Shrika G.1ORCID,Freitas Elisabete1,Serafini Marco1ORCID,Gaspar M. Manuela1ORCID,Capela Rita1ORCID,Gomes Pedro1,Jordaan Audrey2,Madureira Ana M.1ORCID,André Vânia34ORCID,Silva Andreia B.5ORCID,Duarte M. Teresa3ORCID,Portugal Isabel1ORCID,Perdigão João1ORCID,Moreira Rui1ORCID,Warner Digby F.26ORCID,Lopes Francisca1ORCID

Affiliation:

1. Instituto de Investigação do Medicamento (iMed.ULisboa) Faculdade de Farmácia Universidade de Lisboa Av. Prof. Gama Pinto 1649–003 Lisboa Portugal

2. Molecular Mycobacteriology Research Unit Department of Pathology and Institute of Infectious Disease and Molecular Medicine Faculty of Health Sciences University of Cape Town Cape Town Rondebosch 7701 South Africa

3. Centro de Química Estrutural Institute of Molecular Sciences Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais 1 1049–001 Lisboa Portugal

4. Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento (IST-ID) Avenida António José de Almeida, n.° 12 1000–043 Lisboa Portugal

5. Faculdade de Farmácia Universidade de Lisboa Av. Prof. Gama Pinto 1649–003 Lisboa Portugal

6. Wellcome Centre for Infectious Diseases Research in Africa University of Cape Town Cape Town Rondebosch 7701 South Africa

Abstract

AbstractWhile N‐acetyl azaaurones have already been disclosed for their potential against tuberculosis (TB), their low metabolic stability remains an unaddressed liability. We now report a study designed to improve the metabolic stability and solubility of the azaaurone scaffold and to identify the structural requirements for antimycobacterial activity. Replacing the N‐acetyl moiety for a N‐carbamoyl group led to analogues with sub‐ and nanomolar potencies against M. tuberculosis H37Rv, as well as equipotent against drug‐susceptible and drug‐resistant M. tuberculosis isolates. The new N‐carbamoyl azaaurones exhibited improved microsomal stability, compared to their N‐acetylated counterparts, with several compounds displaying moderate to high kinetic solubility. The frequency of spontaneous resistance to azaaurones was observed to be in the range of 10−8, a value that is comparable to current TB drugs in the market. Overall, these results reveal that azaaurones are amenable to structural modifications to improve metabolic and solubility liabilities, and highlight their potential as antimycobacterial agents.

Funder

South African Medical Research Council

Publisher

Wiley

Subject

Organic Chemistry,General Pharmacology, Toxicology and Pharmaceutics,Molecular Medicine,Drug Discovery,Biochemistry,Pharmacology

Reference64 articles.

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