Volume 351, Issue 12 1800177
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Synthesis and antimycobacterial activity of (+)-usnic acid conjugates

Daniela Cirillo

Corresponding Author

Daniela Cirillo

Division of Infectious Diseases, Immunology and Transplantation, Emerging Bacterial Pathogens Unit, San Raffaele Scientific Institute, Milan, Italy

Correspondence

Dr. Luisella Verotta, Department of Environmental Science and Policy, Università degli Studi di Milano, via C. Golgi 19, 20133 Milano, Italy.

Email: [email protected]

Dr. Daniela Cirillo, Division of Infectious Diseases, Immunology and Transplantation, Emerging Bacterial Pathogens Unit, San Raffaele Scientific Institute, via Olgettina 60, 20132 Milano, Italy.

Email: [email protected]

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Emanuele Borroni

Emanuele Borroni

Division of Infectious Diseases, Immunology and Transplantation, Emerging Bacterial Pathogens Unit, San Raffaele Scientific Institute, Milan, Italy

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Irene Festoso

Irene Festoso

Division of Infectious Diseases, Immunology and Transplantation, Emerging Bacterial Pathogens Unit, San Raffaele Scientific Institute, Milan, Italy

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Diego Monti

Diego Monti

Department of Chemistry, ISTM-CNR, Milan, Italy

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Sergio Romeo

Sergio Romeo

Department of Pharmaceutical Sciences, Università degli Studi di Milano, Milan, Italy

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Dominique Mazier

Dominique Mazier

Sorbonne Universités, Centre d'Immunologie et des Maladies Infectieuses, Paris, France

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Luisella Verotta

Corresponding Author

Luisella Verotta

Department of Environmental Science and Policy, Università degli Studi di Milano, Milan, Italy

Consorzio Interuniversitario Nazionale Metodologie e Processi Innovativi di Sintesi, MIlan, Italy

Correspondence

Dr. Luisella Verotta, Department of Environmental Science and Policy, Università degli Studi di Milano, via C. Golgi 19, 20133 Milano, Italy.

Email: [email protected]

Dr. Daniela Cirillo, Division of Infectious Diseases, Immunology and Transplantation, Emerging Bacterial Pathogens Unit, San Raffaele Scientific Institute, via Olgettina 60, 20132 Milano, Italy.

Email: [email protected]

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First published: 08 November 2018
Citations: 12

Abstract

New therapeutics are urgently needed to fight tuberculosis and mycobacteria-related diseases that are a major health hazard especially in poor countries. Natural products have been the source of important antitubercular drugs in the past and still need to receive attention as a potent reservoir of chemical structures. Fifteen known and two new (+)-usnic acid (a benzofurandione formerly isolated from lichens) enamines and hydrazones are here described and tested against sensitive and multidrug-resistant strains of mycobacteria. Among several (+)-usnic acid conjugates, PS14 and PS18 showed potent activity against both susceptible and resistant Mycobacterium tuberculosis strains (MIC values of 1–32 and 2–32 mg/L, respectively) comparable with MIC of other antitubercular drugs already in use for tuberculosis treatment.

CONFLICT OF INTEREST

The authors declare no conflict of interest.

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