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Salado IG, Singh AK, Moreno-Cinos C, Sakaine G, Siderius M, Van der Veken P, Matheeussen A, van der Meer T, Sadek P, Gul S, Maes L, Sterk GJ, Leurs R, Brown D, Augustyns K. Lead Optimization of Phthalazinone Phosphodiesterase Inhibitors as Novel Antitrypanosomal Compounds. J Med Chem 2020; 63:3485-3507. [PMID: 32196340 DOI: 10.1021/acs.jmedchem.9b00985] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Human African trypanosomiasis is causing thousands of deaths every year in the rural areas of Africa. In this manuscript we describe the optimization of a family of phtalazinone derivatives. Phosphodiesterases have emerged as attractive molecular targets for a novel treatment for a variety of neglected parasitic diseases. Compound 1 resulted in being a potent TbrPDEB1 inhibitor with interesting activity against T. brucei in a phenotypic screen. Derivative 1 was studied in an acute in vivo mouse disease model but unfortunately showed no efficacy due to low metabolic stability. We report structural modifications to achieve compounds with an improved metabolic stability while maintaining high potency against TbrPDEB1 and T. brucei. Compound 14 presented a good microsomal stability in mouse and human microsomes and provides a good starting point for future efforts.
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Affiliation(s)
- Irene G Salado
- Laboratory of Medicinal Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
| | - Abhimanyu K Singh
- School of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, United Kingdom
| | - Carlos Moreno-Cinos
- Laboratory of Medicinal Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
| | - Guna Sakaine
- Laboratory of Medicinal Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
| | - Marco Siderius
- Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines & Systems, Faculty of Science, Vrije Universiteit Amsterdam, 1081 Amsterdam, The Netherlands
| | - Pieter Van der Veken
- Laboratory of Medicinal Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
| | - An Matheeussen
- Laboratory for Microbiology, Parasitology and Hygiene (LMPH), University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
| | - Tiffany van der Meer
- Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines & Systems, Faculty of Science, Vrije Universiteit Amsterdam, 1081 Amsterdam, The Netherlands
| | - Payman Sadek
- Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines & Systems, Faculty of Science, Vrije Universiteit Amsterdam, 1081 Amsterdam, The Netherlands
| | - Sheraz Gul
- Fraunhofer-IME SP, Schnackenburgallee 114, Hamburg 22525, Germany
| | - Louis Maes
- Laboratory for Microbiology, Parasitology and Hygiene (LMPH), University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
| | - Geert-Jan Sterk
- Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines & Systems, Faculty of Science, Vrije Universiteit Amsterdam, 1081 Amsterdam, The Netherlands
| | - Rob Leurs
- Medicinal Chemistry, Amsterdam Institute of Molecules, Medicines & Systems, Faculty of Science, Vrije Universiteit Amsterdam, 1081 Amsterdam, The Netherlands
| | - David Brown
- School of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, United Kingdom
| | - Koen Augustyns
- Laboratory of Medicinal Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
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