Multicomponent Reaction Strategies in Organic Synthesis

Multicomponent reactions (MCRs) enable the assembly of three or more building blocks in a single operation, combining efficiency with high atom economy and molecular diversity. Central strategies include isocyanide-based MCRs (notably Ugi and Passerini reactions), boron-Mannich variants (Petasis reactions) and cascade sequences that integrate cycloadditions or oxidative steps. Mechanistic innovation—such as exploiting zwitterionic intermediates or dipolar cycloadditions—underpins the precise control of chemoselectivity and stereochemistry. Recent trends focus on enantioselective catalysis, automated synthesis platforms and sustainable conditions (for example, solvent engineering and solvent-free protocols). These advances facilitate rapid access to heterocycles, peptidomimetics, macrocycles and drug-like scaffolds, illustrating the global importance of MCRs in accelerating lead generation, streamlining process chemistry and meeting green-chemistry benchmarks.

Research from Nature Portfolio

Recent studies have achieved enantioselective isocyanide-based multicomponent processes employing a chiral magnesium catalyst. By tuning reaction parameters, researchers have realised three- and four-component variants that furnish enantioenriched tetrazoles and dihydroisoquinoline derivatives with high stereocontrol. Mechanistic investigations have highlighted the role of zwitterionic intermediates, the impact of water and ligand excess on catalytic cycles, and the exploitation of dipolar intermediates in asymmetric dearomative annulations. These advances lay groundwork for stereodivergent access to nitrogen heterocycles and deepen understanding of catalyst–substrate cooperativity.

Multicomponent Reaction Strategies in Organic Synthesis publication trend

The graph below shows the total number of articles in multicomponent reaction strategies in organic synthesis across all publications each year (not limited to Nature Index journals).

Technical terms

Multicomponent reaction (MCR): A one-pot process combining three or more reactants to form a single product with high atom economy and structural complexity.

Isocyanide-based multicomponent reaction (IMCR): A class of MCRs using isocyanides as key building blocks, notably including the Ugi and Passerini reactions.

Ugi reaction: A four-component coupling of an amine, carbonyl compound, carboxylic acid and isocyanide to afford α-acylamino amides.

Petasis reaction: A boron-Mannich reaction involving a boronic acid, an amine and a carbonyl derivative to yield functionalised amines with stereochemical control.

Dearomative annulation: A cyclisation process that transforms an aromatic system into a non-aromatic cyclic scaffold, often with high stereoselectivity.

Zwitterionic intermediate: A reactive species bearing both positive and negative charges, commonly encountered in IMCR mechanisms to facilitate bond formation.

References

1. Merging the Isonitrile‐Tetrazine (4+1) Cycloaddition and the Ugi Four‐Component Reaction into a Single Multicomponent Process. Angewandte Chemie International Edition (2023).
2. Amenamevir by Ugi-4CR. Green Chemistry (2023).
3. Reactivity and Synthetic Applications of Multicomponent Petasis Reactions. Chemical Reviews (2019).
4. Asymmetric synthesis of tetrazole and dihydroisoquinoline derivatives by isocyanide-based multicomponent reactions. Nature Communications (2019).