Molecules that contain the β-arylethylamine motif have applications in the modulation of pain, treatment of neurological disorders and management of opioid addiction, among others, making it a privileged scaffold in drug discovery1,2. De novo methods for their assembly are reliant on transformations that convert a small class of feedstocks into the target compounds via time-consuming multistep syntheses3,4,5. Synthetic invention can drive the investigation of the chemical space around this scaffold to further expand its capabilities in biology6,7,8,9. Here we report the development of a dual catalysis platform that enables a multicomponent coupling of alkenes, aryl electrophiles and a simple nitrogen nucleophile, providing single-step access to synthetically versatile and functionally diverse β-arylethylamines. Driven by visible light, two discrete copper catalysts orchestrate aryl-radical formation and azido-group transfer, which underpin an alkene azidoarylation process. The process shows broad scope in alkene and aryl components and an azide anion performs a multifaceted role both as a nitrogen source and in mediating the redox-neutral dual catalysis via inner-sphere electron transfer10,11. The synthetic capabilities of this anion-mediated alkene functionalization process are likely to be of use in a variety of pharmaceutically relevant and wider synthetic applications.
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Materials and methods, optimization studies, experimental procedures, mechanistic studies, 1H NMR, 13C NMR and 19F NMR spectra, and high-resolution mass spectrometry, infrared, ultraviolet–visible and cyclic voltammetry data are available in the Supplementary Information. Crystallographic data are available free of charge from the Cambridge Crystallographic Data Centre under the reference numbers CCDC 2027142, CCDC 2027143 and CCDC 2032989. Raw data are available from the corresponding author on reasonable request.
Freeman, S. & Alder, J. F. Arylethylamine psychotropic recreational drugs: a chemical perspective. Eur. J. Med. Chem. 37, 527–539 (2002).
Dalley, J. W. & Everitt, B. J. Dopamine receptors in the learning, memory and drug reward circuitry. Semin. Cell Dev. Biol. 20, 403–410 (2009).
Barton, D. H. R., Bracho, R. D. & Widdowson, D. A. A new β-arylethylamine synthesis by aryl aldehyde homologation. J. Chem. Soc. Chem. Commun. 781a–781a (1973).
Schulze, M. Synthesis of 2-arylethylamines by the curtius rearrangement. Synth. Commun. 40, 1461–1476 (2010).
Bracher, F. Methods for arylethylation of amines and heteroarenes. SynOpen 02, 0096–0104 (2018).
Müller, T. E., Hultzsch, K. C., Yus, M., Foubelo, F. & Tada, M. Hydroamination: direct addition of amines to alkenes and alkynes. Chem. Rev. 108, 3795–3892 (2008).
Nguyen, T. M., Manohar, N. & Nicewicz, D. A. Anti-Markovnikov hydroamination of alkenes catalyzed by a two-component organic photoredox system: direct access to phenethylamine derivatives. Angew. Chem. Int. Edn 53, 6198–6201 (2014).
Boyington, A. J., Seath, C. P., Zearfoss, A. M., Xu, Z. & Jui, N. T. Catalytic strategy for regioselective arylethylamine synthesis. J. Am. Chem. Soc. 141, 4147–4153 (2019).
Estrada, J. G., Williams, W. L., Ting, S. I. & Doyle, A. G. Role of electron-deficient olefin ligands in a Ni-catalyzed aziridine cross-coupling to generate quaternary carbons. J. Am. Chem. Soc. 142, 8928–8937 (2020).
Haim, A. Role of the bridging ligand in inner-sphere electron-transfer reactions. Acc. Chem. Res. 8, 264–272 (1975).
Rorabacher, D. B. Electron transfer by copper centers. Chem. Rev. 104, 651–698 (2004).
Zeng, W. & Chemler, S. R. Copper(II)-catalyzed enantioselective intramolecular carboamination of alkenes. J. Am. Chem. Soc. 129, 12948–12949 (2007).
Zhang, G., Cui, L., Wang, Y. & Zhang, L. Homogeneous gold-catalyzed oxidative carboheterofunctionalization of alkenes. J. Am. Chem. Soc. 132, 1474–1475 (2010).
Brenzovich, W. E. Jr et al. Gold-catalyzed intramolecular aminoarylation of alkenes: C–C bond formation through bimolecular reductive elimination. Angew. Chem. Int. Edn 49, 5519–5522 (2010).
Schultz, D. M. & Wolfe, J. P. Recent developments in palladium-catalyzed alkene aminoarylation reactions for the synthesis of nitrogen heterocycles. Synthesis 44, 351–361 (2012).
Yang, H.-B., Pathipati, S. R. & Selander, N. Nickel-catalyzed 1,2-aminoarylation of oxime ester-tethered alkenes with boronic acids. ACS Catal. 7, 8441–8445 (2017).
Lerchen, A., Knecht, T., Daniliuc, C. G. & Glorius, F. Unnatural amino acid synthesis enabled by the regioselective cobalt(III)-catalyzed intermolecular carboamination of alkenes. Angew. Chem. Int. Edn 55, 15166–15170 (2016).
Liu, Z. et al. Catalytic intermolecular carboamination of unactivated alkenes via directed aminopalladation. J. Am. Chem. Soc. 139, 11261–11270 (2017).
van der Puyl, V. A., Derosa, J. & Engle, K. M. Directed, nickel-catalyzed umpolung 1,2-carboamination of alkenyl carbonyl compounds. ACS Catal. 9, 224–229 (2019).
Jiang, H. & Studer, A. Intermolecular radical carboamination of alkenes. Chem. Soc. Rev. 49, 1790–1811 (2020).
Monos, T. M., McAtee, R. C. & Stephenson, C. R. J. Arylsulfonylacetamides as bifunctional reagents for alkene aminoarylation. Science 361, 1369–1373 (2018).
Wang, D. et al. Asymmetric copper-catalyzed intermolecular aminoarylation of styrenes: efficient access to optical 2,2-diarylethylamines. J. Am. Chem. Soc. 139, 6811–6814 (2017).
Heinrich, M. R., Blank, O. & Wölfel, S. Reductive carbodiazenylation of nonactivated olefins via aryl diazonium salts. Org. Lett. 8, 3323–3325 (2006).
Fumagalli, G., Boyd, S. & Greaney, M. F. Oxyarylation and aminoarylation of styrenes using photoredox catalysis. Org. Lett. 15, 4398–4401 (2013).
PrasadHari, D., Hering, T. & König, B. The photoredox-catalyzed meerwein addition reaction: intermolecular amino-arylation of alkenes. Angew. Chem. Int. Edn 53, 725–728 (2014).
Cativiela, C. & Díaz-de-Villegas, M. D. Recent progress on the stereoselective synthesis of acyclic quaternary α-amino acids. Tetrahedron Asymmetry 18, 569–623 (2007).
Venkatraman, J., Shankaramma, S. C. & Balaram, P. Design of folded peptides. Chem. Rev. 101, 3131–3152 (2001).
Hager, A., Vrielink, N., Hager, D., Lefranc, J. & Trauner, D. Synthetic approaches towards alkaloids bearing α-tertiary amines. Nat. Prod. Rep. 33, 491–522 (2016).
Clayden, J., Donnard, M., Lefranc, J. & Tetlow, D. J. Quaternary centres bearing nitrogen (α-tertiary amines) as products of molecular rearrangements. Chem. Commun. 47, 4624–4639 (2011).
Leggans, E. K., Barker, T. J., Duncan, K. K. & Boger, D. L. Iron(III)/NaBH4-mediated additions to unactivated alkenes: synthesis of novel 20′-vinblastine analogues. Org. Lett. 14, 1428–1431 (2012).
Huang, X., Bergsten, T. M. & Groves, J. T. Manganese-catalyzed late-stage aliphatic C–H azidation. J. Am. Chem. Soc. 137, 5300–5303 (2015).
Bunescu, A., Ha, T. M., Wang, Q. & Zhu, J. Copper-catalyzed three-component carboazidation of alkenes with acetonitrile and sodium azide. Angew. Chem. Int. Edn 56, 10555–10558 (2017).
Fu, N., Sauer, G. S., Saha, A., Loo, A. & Lin, S. Metal-catalyzed electrochemical diazidation of alkenes. Science 357, 575–579 (2017).
Heinrich, M. R. Intermolecular olefin functionalisation involving aryl radicals generated from arenediazonium salts. Chem. Eur. J. 15, 820–833 (2009).
Fischer, H. & Radom, L. Factors controlling the addition of carbon-centered radicals to alkenes—an experimental and theoretical perspective. Angew. Chem. Int. Edn 40, 1340–1371 (2001).
Odian, G.in Principles of Polymerization (ed. Odian, G.) 198–349 (Wiley, 2004); https://doi.org/10.1002/047147875X.ch3.
Tang, W. et al. Understanding atom transfer radical polymerization: effect of ligand and initiator structures on the equilibrium constants. J. Am. Chem. Soc. 130, 10702–10713 (2008).
Qiu, J., Matyjaszewski, K., Thouin, L. & Amatore, C. Cyclic voltammetric studies of copper complexes catalyzing atom transfer radical polymerization. Macromol. Chem. Phys. 201, 1625–1631 (2000).
Caldwell, J. J. et al. Identification of 4-(4-aminopiperidin-1-yl)-7H-pyrrolo[2,3-d]pyrimidines as selective inhibitors of protein kinase B through fragment elaboration. J. Med. Chem. 51, 2147–2157 (2008).
Addie, M. et al. Discovery of 4-amino-N-[(1S)-1-(4-chlorophenyl)-3-hydroxypropyl]-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxamide (AZD5363), an orally bioavailable, potent inhibitor of Akt kinases. J. Med. Chem. 56, 2059–2073 (2013).
Goel, P. et al. Recent advancement of piperidine moiety in treatment of cancer—a review. Eur. J. Med. Chem. 157, 480–502 (2018).
Suh, S.-E. et al. Site-selective copper-catalyzed azidation of benzylic C–H bonds. J. Am. Chem. Soc. 142, 11388–11393 (2020).
Alfassi, Z. B., Harriman, A., Huie, R. E., Mosseri, S. & Neta, P. The redox potential of the azide/azidyl couple. J. Phys. Chem. 91, 2120–2122 (1987).
Pavlishchuk, V. V. & Addison, A. W. Conversion constants for redox potentials measured versus different reference electrodes in acetonitrile solutions at 25 °C. Inorg. Chim. Acta 298, 97–102 (2000).
Bard, A. Standard Potentials in Aqueous Solution (Routledge, 1985).
Zhou, J. & Fu, G. C. Cross-couplings of unactivated secondary alkyl halides: room-temperature nickel-catalyzed Negishi reactions of alkyl bromides and iodides. J. Am. Chem. Soc. 125, 14726–14727 (2003).
Wang, Z., Yin, H. & Fu, G. C. Catalytic enantioconvergent coupling of secondary and tertiary electrophiles with olefins. Nature 563, 379–383 (2018).
We thank the Herchel Smith Fund at the University of Cambridge for a postdoctoral fellowship to A.B., the AstraZeneca–University of Cambridge PhD programme for studentship (Y.A.) and the Royal Society for Wolfson Merit Award to M.J.G.
The authors declare no competing interests.
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Bunescu, A., Abdelhamid, Y. & Gaunt, M.J. Multicomponent alkene azidoarylation by anion-mediated dual catalysis. Nature 598, 597–603 (2021). https://doi.org/10.1038/s41586-021-03980-8
Nature Chemistry (2022)
Nature Reviews Chemistry (2022)