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| Diels–Alder reaction | |
|---|---|
| Name | Diels–Alder reaction |
| Type | Cycloaddition |
| Discovered | 1928 |
| Discoverers | Otto Diels; Kurt Alder |
Diels–Alder reaction is a [4+2] cycloaddition that forms six-membered rings by combining a conjugated diene and a dienophile. The transformation is foundational in synthetic organic chemistry for building cyclic frameworks found in natural products, pharmaceuticals, and materials, and it has influenced figures and institutions across chemical research. Its development and applications intersect with laboratories, awards, and universities worldwide.
The reaction was discovered in 1928 by Otto Diels and Kurt Alder while working within German chemical institutions and later recognized by the Nobel Prize in Chemistry committee, connecting to the legacy of laureates such as Richard Willstätter and institutions like the Kaiser Wilhelm Society. Early work involved collaborations among laboratories in Berlin, Breslau, and industrial research at companies including Bayer AG and IG Farben. Subsequent expansion drew interest from academic groups at Harvard University, University of Oxford, Massachusetts Institute of Technology, University of California, Berkeley, and national laboratories such as Lawrence Berkeley National Laboratory. The reaction influenced synthetic strategies in industrial settings like Eli Lilly and Company, Merck & Co., and BASF, and was featured in retrosynthetic analyses developed by chemists associated with E.J. Corey and the American Chemical Society.
The mechanism follows a concerted pericyclic pathway described by concepts from Woodward–Hoffmann rules and theoretical work by figures linked to Roald Hoffmann and Robert B. Woodward. Molecular orbital interactions between the highest occupied molecular orbital of the diene and the lowest unoccupied molecular orbital of the dienophile govern the transformation, connecting to theoretical methods developed at Bell Labs, IBM Research, and university groups at California Institute of Technology. Computational studies from research groups at ETH Zurich, Max Planck Society, and CNRS employ methods such as density functional theory pioneered by scientists associated with Walter Kohn and institutions like Princeton University. The pericyclic transition state can be classified as suprafacial on both components, a conclusion influenced by work from scholars linked to Yale University, Columbia University, and Stanford University.
The scope encompasses intramolecular and intermolecular variants used to synthesize cyclohexenes, bridged bicyclics, and polycyclic frameworks found in targets studied at Scripps Research Institute, Rockefeller University, and pharmaceutical programs at GlaxoSmithKline. Natural product syntheses from research groups at University of Cambridge, California Institute of Technology, and Princeton University often employ the reaction to assemble ring systems in molecules pursued by teams affiliated with Scripps Institution of Oceanography and museums with collections linked to Smithsonian Institution. Applications extend to agrochemicals developed at Syngenta, to materials science projects at Dow Chemical Company and DuPont, and to total syntheses reported in journals of societies like the Royal Society of Chemistry and the American Chemical Society.
Control of stereochemistry and regiochemistry is central to predictability in syntheses carried out by groups at Imperial College London, Johns Hopkins University, and Utrecht University. Endo versus exo selectivity, secondary orbital interactions, and substituent effects are analyzed with models influenced by researchers connected to Pierre Laurent-style mechanistic schools and teaching lineages reaching back to Robert Burns Woodward. Regiochemical outcomes are rationalized using Frontier Molecular Orbital theory developed by communities at Indiana University Bloomington and computational centers at Los Alamos National Laboratory. Stereochemical control is exploited in asymmetric catalysis collaborations involving investigators from ETH Zurich, University of Tokyo, and Riken.
Variants include intramolecular cycloadditions explored in laboratories at Columbia University, hetero-Diels–Alder analogues involving oxygen or nitrogen developed in teams at University of Illinois Urbana-Champaign and University of Michigan, and inverse-electron-demand processes studied by groups at University of California, San Diego. Related pericyclic reactions and rearrangements have been examined by research networks spanning National Institutes of Health, European Molecular Biology Laboratory, and institutions such as Karolinska Institutet and Max Planck Institute for Coal Research. Transformations inspired new named reactions in the repertoires of synthetic chemists trained at University of Pennsylvania and University of Wisconsin–Madison.
Catalysis strategies include Lewis acid catalysis developed in industry-academia partnerships involving AstraZeneca, chiral organocatalysis advanced by groups at University of Basel and University of Oxford, and transition-metal promoted variants investigated in laboratories at University of Chicago and University of Toronto. Solvent and temperature effects were systematically studied in projects supported by funding agencies such as the National Science Foundation and European Research Council. High-pressure Diels–Alder protocols were refined in collaborations with experimental facilities at Argonne National Laboratory and Oak Ridge National Laboratory. Flow chemistry adaptations were implemented by teams at MIT and ETH Zurich.
Typical experimental procedures are taught in curricula at University of California, Los Angeles, University of Edinburgh, and Technische Universität München and executed in teaching labs at institutions like University of Manchester. Model reactions include cycloadditions of 1,3-butadiene derivatives with activated alkenes, exemplified in syntheses reported by research groups at Scripps Research and pharmaceutical case studies from Pfizer. Representative laboratory techniques employ ovens, Schlenk lines, and analytical equipment available from companies such as Agilent Technologies and Bruker Corporation, with characterization performed using instruments found at National Institute of Standards and Technology and university core facilities. Examples drawn from total syntheses appear in publications from groups affiliated with Harvard Medical School, Yale School of Medicine, and Columbia University Medical Center.
Category:Organic reactions