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Zeng Y, Gao H, Jiang ZT, Zhu Y, Chen J, Zhang H, Lu G, Xia Y. Observation of unusual outer-sphere mechanism using simple alkenes as nucleophiles in allylation chemistry. Nat Commun 2024; 15:4317. [PMID: 38773086 PMCID: PMC11109239 DOI: 10.1038/s41467-024-48541-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Accepted: 05/06/2024] [Indexed: 05/23/2024] Open
Abstract
Transition-metal catalyzed allylic substitution reactions of alkenes are among the most efficient methods for synthesizing diene compounds, driven by the inherent preference for an inner-sphere mechanism. Here, we present a demonstration of an outer-sphere mechanism in Rh-catalyzed allylic substitution reaction of simple alkenes using gem-difluorinated cyclopropanes as allyl surrogates. This unconventional mechanism offers an opportunity for the fluorine recycling of gem-difluorinated cyclopropanes via C - F bond cleavage/reformation, ultimately delivering allylic carbofluorination products. The developed method tolerates a wide range of simple alkenes, providing access to secondary, tertiary fluorides and gem-difluorides with 100% atom economy. DFT calculations reveal that the C - C bond formation goes through an unusual outer-sphere nucleophilic substitution of the alkenes to the allyl-Rh species instead of migration insertion, and the generated carbon cation then forms the C - F bond with tetrafluoroborate as a fluoride shuttle.
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Affiliation(s)
- Yaxin Zeng
- West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, and State Key Laboratory of Biotherapy, Sichuan University, Chengdu, 610041, China
| | - Han Gao
- School of Chemistry and Chemical Engineering, Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, 250100, China
| | - Zhong-Tao Jiang
- West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, and State Key Laboratory of Biotherapy, Sichuan University, Chengdu, 610041, China
| | - Yulei Zhu
- West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, and State Key Laboratory of Biotherapy, Sichuan University, Chengdu, 610041, China
| | - Jinqi Chen
- West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, and State Key Laboratory of Biotherapy, Sichuan University, Chengdu, 610041, China
| | - Han Zhang
- West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, and State Key Laboratory of Biotherapy, Sichuan University, Chengdu, 610041, China
| | - Gang Lu
- School of Chemistry and Chemical Engineering, Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, 250100, China.
| | - Ying Xia
- West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, and State Key Laboratory of Biotherapy, Sichuan University, Chengdu, 610041, China.
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Lin D, Lechermann LM, Huestis MP, Marik J, Sap JBI. Light-Driven Radiochemistry with Fluorine-18, Carbon-11 and Zirconium-89. Angew Chem Int Ed Engl 2024; 63:e202317136. [PMID: 38135665 DOI: 10.1002/anie.202317136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 12/18/2023] [Accepted: 12/20/2023] [Indexed: 12/24/2023]
Abstract
This review discusses recent advances in light-driven radiochemistry for three key isotopes: fluorine-18, carbon-11, and zirconium-89, and their applications in positron emission tomography (PET). In the case of fluorine-18, the predominant approach involves the use of cyclotron-produced [18F]fluoride or reagents derived thereof. Light serves to activate either the substrate or the fluorine-18 labeled reagent. Advancements in carbon-11 photo-mediated radiochemistry have been leveraged for the radiolabeling of small molecules, achieving various transformations, including 11C-methylation, 11C-carboxylation, 11C-carbonylation, and 11C-cyanation. Contrastingly, zirconium-89 photo-mediated radiochemistry differs from fluorine-18 and carbon-11 approaches. In these cases, light facilitates a postlabeling click reaction, which has proven valuable for the labeling of large biomolecules such as monoclonal antibodies (mAbs). New technological developments, such as the incorporation of photoreactors in commercial radiosynthesizers, illustrate the commitment the field is making in embracing photochemistry. Taken together, these advances in photo-mediated radiochemistry enable radiochemists to apply new retrosynthetic strategies in accessing novel PET radiotracers.
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Affiliation(s)
- Daniel Lin
- Department of Translational Imaging, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA
- Current address: University of Southern California Department of Chemistry, Loker Hydrocarbon Research Institute, 837 Bloom Walk, Los Angeles, CA 90089, USA
| | - Laura M Lechermann
- Department of Translational Imaging, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Malcolm P Huestis
- Discovery Chemistry, Genentech, Inc., DNA Way, South San Francisco, CA 94080, USA
| | - Jan Marik
- Department of Translational Imaging, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA
- Discovery Chemistry, Genentech, Inc., DNA Way, South San Francisco, CA 94080, USA
| | - Jeroen B I Sap
- Department of Translational Imaging, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA
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