The Diels-Alder reaction with inverse-electron-demand (iEDDA) stands as a cornerstone in contemporary chemical synthesis, offering unparalleled efficiency and versatility in molecular ligation. This review explores the multifaceted capabilities of iEDDA as a click reaction for precise molecular partnering. From its mechanistic underpinnings to its applications across diverse fields, this synthesis tool is unraveled for its transformative potential in modern chemistry. The scope of iEDDA is assessed through the lens of selectivity, substrate compatibility, and its role as a key enabler in drug discovery, materials science, and bioconjugation strategies. By navigating the intricacies of iEDDA, we shed light on its role as a catalyst for unlocking molecular precision in chemical synthesis.

Diels-Alder reaction, Inverse-electron-demand, Click chemistry

Kohn M, Breinbauer R. The Staudinger ligation-a gift to chemical biology. Angew Chem Int Ed Engl. 2004; 43: 3106-16.

Kolb HC, Finn MG, Sharpless KB. Click Chemistry: Diverse Chemical Function from a Few Good Reactions. Angew Chem Int Ed Engl. 2001; 40: 2004-21.

Huisgen R. Theory of 1,3-Dipolar Cycloadditions. In: Padwa A, editor. 1,3-Dipolar Cycloaddition Chemistry. New York: Wiley; 1984: 1-176.

Rostovtsev VV, Green LG, Fokin VV, et al. A stepwise huisgen cycloaddition process: copper(I)-catalyzed regioselective "ligation" of azides and terminal alkynes. Angew Chem Int Ed Engl. 2002; 41: 2596-9.

Chan TR, Hilgraf R, Sharpless KB, et al. Polytriazoles as copper(I)-stabilizing ligands in catalysis. Organic Letters. 2004; 6: 2853-5.

Bock VD, Hiemstra H, van Maarseveen JH. Cu-I-catalyzed alkyne-azide "click" cycloadditions from a mechanistic and synthetic perspective. European Journal of Organic Chemistry. 2005; : 51-68.

Tornoe CW, Christensen C, Meldal M. Peptidotriazoles on solid phase: [1,2,3]-triazoles by regiospecific copper(I)-catalyzed 1,3-dipolar cycloadditions of terminal alkynes to azides. Journal of Organic Chemistry. 2002; 67: 3057-64.

Rozkiewicz DI, Janczewski D, Verboom W, et al. "Click" chemistry by microcontact printing. Angew Chem Int Ed Engl. 2006; 45: 5292-6.

Parrish B, Breitenkamp RB, Emrick T. PEG- and peptide-grafted aliphatic polyesters by click chemistry. J Am Chem Soc. 2005; 127: 7404-10.

Diaz DD, Punna S, Holzer P, et al. Click chemistry in materials synthesis. 1. Adhesive polymers from copper-catalyzed azide-alkyne cycloaddition. Journal of Polymer Science Part A-Polymer Chemistry. 2004; 42: 4392-403.