Multi-component reactions (MCRs) are widely employed for the rapid assembly of compound arrays with high molecular diversity. Therefore, they have recently gained much attention in pharmaceutical research, especially in the context of lead finding and lead optimization. Coupled with a post-condensation modification, their utility is increased even further, giving rise to numerous pharmacologically important scaffolds. In the course of this work, the results of our research on new post-condensation modifications were presented. First, diverse combinations of the Ugi-four component reaction with different palladium assisted post-condensations were developed. Thus, indol-2-ones, indoles and 1H-indoles were synthesized by a new Ugi-4CR-Heck reaction in a one-pot two-step strategy. Furthermore, phenanthridin-6-ones or phenanthridines were accessible by a new combination of an Ugi-4CR-palladium catalyzed biaryl coupling reaction. Finally, a novel sequential solution phase procedure for the preparation of indol-2-ones, quinoxalin-2-ones and benzodiazepine-2,5-diones based on the combination of the Ugi-4CR followed by a palladium-assisted amidation was described. At the same time, a new combinatorial synthetic route yielding fused tetrazolo[1,5-a]quinoxalines was reported. The use of 2-fluorophenylisocyanide in the Ugi-tetrazole reaction (tetrazole-U-4CR) followed by a nucleophilic aromatic substitution (SNAr) affords the tricylic tetrazolo[1,5-a]quinoxaline moiety. At last, the domino-reaction 3CR-Hetero-DielsAlder-Retro-Cycloreversion was optimized to synthesize functionalized pyrrolo[3,4-b]pyridin-5-ones using bi-functional starting materials. In conclusion, the obtained heterocycles are containing three to five points of potential diversity. Due to their facile and rapid production protocol, access to thousands of compounds containing the outlined important pharmacophoric scaffolds is now feasible.
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Multi-component reactions (MCRs) are widely employed for the rapid assembly of compound arrays with high molecular diversity. Therefore, they have recently gained much attention in pharmaceutical research, especially in the context of lead finding and lead optimization. Coupled with a post-condensation modification, their utility is increased even further, giving rise to numerous pharmacologically important scaffolds. In the course of this work, the results of our research on new post-condensati...
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