ArticleChembiochem : a European journal of chemical biology2022
Synthesis of 6,6- and 7,7-Difluoro-1-acetamidopyrrolizidines and Their Oxidation Catalyzed by the Nonheme Fe Oxygenase LolO.
Article in Chembiochem : a European journal of chemical biology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed, 9 citations in OpenAlex.
- Experimental and Computational Elucidation of C(sp3)-H Fluorination Barriers in an Iron(II)- and 2-Oxoglutarate-Dependent Halogenase.Journal of the American Chemical Society · 2026Article
- Sulfur-ligated iron(iv)-imido and iron(iv)-oxo complexes, which one is more reactive?Chemical science · 2026Article
- Substrate Epoxidation Catalyzed by the Nonheme Iron Dioxygenase Dapdiamide Biosynthesis Enzyme C. Why Is the Substrate Tethered?Chemistry (Weinheim an der Bergstrasse, Germany) · 2025Article
- An Unusual Ferryl Intermediate and Its Implications for the Mechanism of Oxacyclization by the Loline-Producing Iron(II)- and 2-Oxoglutarate-Dependent Oxygenase, LolO.Biochemistry · 2024Article
- Mechanistic Studies of Aziridine Formation Catalyzed by Mononuclear Non-Heme Iron Enzymes.Journal of the American Chemical Society · 2023Article
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5 authors at 2 institutions in 1 country.
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Abstract
LolO, a 2-oxoglutarate-dependent nonheme Fe oxygenase, catalyzes both the hydroxylation of 1-exo-acetamidopyrrolizidine (AcAP), a pathway intermediate in the biosynthesis of the loline alkaloids, and the cycloetherification of the resulting alcohol. We have prepared fluorinated AcAP analogues to aid in continued mechanistic investigation of the remarkable LolO-catalyzed cycloetherification step. LolO was able to hydroxylate 6,6-difluoro-AcAP (prepared from N,O-protected 4-oxoproline) and then cycloetherify the resulting alcohol, forming a difluorinated analogue of N-acetylnorloline and providing evidence for a cycloetherification mechanism involving a C(7) radical as opposed to a C(7) carbocation. By contrast, LolO was able to hydroxylate 7,7-difluoro-AcAP (prepared from 3-oxoproline) but failed to cycloetherify it, forming (1R,2R,8S)-7,7-difluoro-2-hydroxy-AcAP as the sole product. The divergent LolO-catalyzed reactions of the difluorinated AcAP analogues provide insight into the LolO cycloetherification mechanism and indicate that the 7,7-difluorinated compound, in particular, may be a useful tool to accumulate and characterize the iron intermediate that initiates the cycloetherification reaction.
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