Halogen atoms in the modern medicinal chemistry: hints for the drug design.
A significant number of drugs and drug candidates in clinical development are halogenated structures. For a long time, insertion of halogen atoms on hit or lead compounds was predominantly performed to exploit their steric effects, through the ability of these bulk atoms to occupy the binding site of molecular targets. However, halogens in drug - target complexes influence several processes rather than steric aspects alone. For example, the formation of halogen bonds in ligand-target complexes is now recognized as a kind of intermolecular interaction that favorably contributes to the stability of ligand-target complexes. This paper is aimed at introducing the fascinating versatility of halogen atoms. It starts summarizing the prevalence of halogenated drugs and their structural and pharmacological features. Next, we discuss the identification and prediction of halogen bonds in protein-ligand complexes, and how these bonds should be exploited. Interesting results of halogen insertions during the processes of hit-to-lead or lead-to-drug conversions are also detailed. Polyhalogenated anesthetics and protein kinase inhibitors that bear halogens are analyzed as cases studies. Thereby, this review serves as one guide for the virtual screening of libraries containing halogenated compounds and may be a source of inspiration for the medicinal chemists.
Hernandes
Marcelo Zaldini
MZ
Departamento de Ciências Farmacêuticas, Centro de Ciências da Saúde, Universidade Federal de Pernambuco (UFPE), 50740-520, Recife, PE, Brazil. zaldini@ufpe.br
Cavalcanti
Suellen Melo T
SM
Moreira
Diogo Rodrigo M
DR
de Azevedo Junior
Walter Filgueira
WF
Leite
Ana Cristina Lima
AC
D000818:Animals; D001665:Binding Sites; D002626:Chemistry, Pharmaceutical / Q000379:methods; D016503:Drug Delivery Systems; D015195:Drug Design; D006219:Halogens / Q000737:chemistry*; D006801:Humans; D008024:Ligands; D008958:Models, Molecular; D011485:Protein Binding
D006219:Halogens; D008024:Ligands