Chemistry strategies in early drug discovery: an overview of recent trends.

In the scenario of a continuous request for better drugs in shorter times, medicinal chemists must face the challenging task of preparing new patentable molecules, combining high activity and selectivity, drug-likeness and good pharmacokinetic properties. Multiparametric optimization requires a substantial improvement of the efficacy and throughput of the early discovery process, leading to a significant revolution in organic synthesis and chemistry technologies. Chemists are searching for ways to simplify synthetic protocols, for example, by the use of polymer-assisted solution-phase synthesis, microwave-assisted organic synthesis and flow chemistry. Organic synthesis is benefiting of fast and robust reactions, with breakthrough approaches often entailing the privileged use of multicomponent reactions, click chemistry and ring-closing metathesis.