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      Multicomponent Reactions towards Heterocycles: Concepts and Applications 1
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Vasco, A. V.; Ceballos, L. G.; Wessjohann, L. A.; Rivera, D. G.; Multicomponent functionalization of the octreotide peptide macrocyclic scaffold Eur. J. Org. Chem. 2022 e202200687 (2022) DOI: 10.1002/ejoc.202200687
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The replacement of the disulfide bridge by other types of side chain linkages has been a continuous endeavor in the development of cyclic peptide drugs with improved metabolic stability. Octreotide is a potent and selective somatostatin analog that has been used as an anticancer agent, in radiolabeled conjugates for the localization of tumors and as targeting moiety in peptide-drug conjugates. Here, we describe an onresin methodology based on a multicomponent macrocyclization that enables the substitution of the disulfide bond by a tertiary lactam bridge functionalized with a variety of exocyclic moieties, including lipids, fluorophores, and charged groups. Conformational analysis in comparison with octreotide provides key information on the type of functionalization permitting the conformational mimicry of the bioactive peptide.

Books and chapters

Ceballos, L. G.; Pacheco, D. F.; Westermann, B.; Garcia-Rivera, D.; Solid-phase heterocycle synthesis using multicomponent reactions Erik Van der Eycken, Upendra K. Sharma Multicomponent Reactions towards Heterocycles: Concepts and Applications 4 139-162 (2022) ISBN:9783527349081 DOI: 10.1002/9783527832439.ch4
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Heterocycle chemistry has traditionally relied on solution-phase synthesis as technological platform to discover and produce bioactive scaffolds. With the advent of solid-phase synthesis (SPS) at the end of last century, combinatorial approaches using on-resin procedures were applied to create skeletal and appendage diversity in heterocyclic compounds. Multicomponent reactions (MCRs) were part of that endeavor for developing solid-phase protocols capable to accelerate drug discovery. This chapter highlights methodological aspects of the implementation of on-resin MCRs to produce heterocycle compounds. Different name reactions, synthetic strategies, and solid supports are analyzed with a critical view hoping to encourage the new generation of chemists to adapt the more recent multicomponent – especially catalytic – processes to the SPS technology.

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