Nonclassical Phenyl Bioisosteres as Effective Replacements in a Series of Novel Open-Source Antimalarials
作者:Edwin G. Tse、Sevan D. Houston、Craig M. Williams、G. Paul Savage、Louis M. Rendina、Irene Hallyburton、Mark Anderson、Raman Sharma、Gregory S. Walker、R. Scott Obach、Matthew H. Todd
DOI:10.1021/acs.jmedchem.0c00746
日期:2020.10.22
The replacement of one chemical motif with another that is broadly similar is a common method in medicinal chemistry to modulate the physical and biological properties of a molecule (i.e., bioisosterism). In recent years, bioisosteres such as cubane and bicyclo[1.1.1]pentane (BCP) have been used as highly effective phenyl mimics. Herein, we show the successful incorporation of a range of phenyl bioisosteres
<i>tele</i>-Substitution Reactions in the Synthesis of a Promising Class of 1,2,4-Triazolo[4,3-<i>a</i>]pyrazine-Based Antimalarials
作者:Marat Korsik、Edwin G. Tse、David G. Smith、William Lewis、Peter J. Rutledge、Matthew H. Todd
DOI:10.1021/acs.joc.0c01045
日期:2020.11.6
We have discovered and studied a tele-substitution reaction in a biologically important heterocyclic ring system. Conditions that favor the tele-substitution pathway were identified: the use of increased equivalents of the nucleophile or decreased equivalents of base or the use of softer nucleophiles, less polar solvents, and larger halogens on the electrophile. Using results from X-ray crystallographic
Synthesis of New Triazolopyrazine Antimalarial Compounds
作者:Daniel Johnson、Ian Jenkins、Cohan Huxley、Mark Coster、Kah Lum、Jonathan White、Vicky Avery、Rohan Davis
DOI:10.3390/molecules26092421
日期:——
(Series 4) resulted in the synthesis of 12 new analogues, which were characterized by NMR, UV, and MS data analysis. The structures of four triazolopyrazines were confirmed by X-ray crystal structure analysis. Several minor and unexpected side products were generated during these studies, including two resulting from a possible disproportionation reaction. All compounds were tested for their ability
An Open Drug Discovery Competition: Experimental Validation of Predictive Models in a Series of Novel Antimalarials
作者:Edwin G. Tse、Laksh Aithani、Mark Anderson、Jonathan Cardoso-Silva、Giovanni Cincilla、Gareth J. Conduit、Mykola Galushka、Davy Guan、Irene Hallyburton、Benedict W. J. Irwin、Kiaran Kirk、Adele M. Lehane、Julia C. R. Lindblom、Raymond Lui、Slade Matthews、James McCulloch、Alice Motion、Ho Leung Ng、Mario Öeren、Murray N. Robertson、Vito Spadavecchio、Vasileios A. Tatsis、Willem P. van Hoorn、Alexander D. Wade、Thomas M. Whitehead、Paul Willis、Matthew H. Todd
DOI:10.1021/acs.jmedchem.1c00313
日期:2021.11.25
The Open Source Malaria (OSM) consortium is developing compounds that kill the human malaria parasite, Plasmodium falciparum, by targeting PfATP4, an essential ion pump on the parasite surface. The structure of PfATP4 has not been determined. Here, we describe a public competition created to develop a predictive model for the identification of PfATP4 inhibitors, thereby reducing project costs associated
Synthesis and characterisation of new antimalarial fluorinated triazolopyrazine compounds
作者:Kah Yean Lum、Jonathan M White、Daniel J G Johnson、Vicky M Avery、Rohan A Davis
DOI:10.3762/bjoc.19.11
日期:——
Plasmodium falciparum (3D7 and Dd2 strains) and the cytotoxicity against a human embryonic kidney (HEK293) cell line were tested. Some of the compounds demonstrated moderate antimalarial activity with IC50 values ranging from 0.2 to >80 µM; none of the compounds displayed any cytotoxicity against HEK293 cells at 80 µM. Antimalarial activity was significantly reduced when C-8 of the triazolopyrazine scaffold