The Use of Conformational Restriction in Medicinal Chemistry.

During the early preclinical phase, from hit identification and optimization to a lead compound, several medicinal chemistry strategies can be used to improve potency and/or selectivity. The conformational restriction is one of these approaches. It consists of introducing some specific structural constraints in a lead candidate to reduce the overall number of possible conformations in order to favor the adoption of a bioactive conformation and, as a consequence, molecular recognition by the target receptor. In this work, we focused on the application of the conformational restriction strategy in the last five years for the optimization of hits and/or leads of several important classes of therapeutic targets in the drug discovery field. Thus, we recognize the importance of several kinase inhibitors to the current landscape of drug development for cancer therapy and the use of G-protein Coupled Receptor (GPCR) modulators. Several other targets are also highlighted, such as the class of epigenetic drugs. Therefore, the possibility of exploiting conformational restriction as a tool to increase the potency and selectivity and promote changes in the intrinsic activity of some ligands intended to act on many different targets makes this strategy of structural modification valuable for the discovery of novel drug candidates.