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- W4224985655 abstract "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 (1 R ,2 R ,8 S )‐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." @default.
- W4224985655 created "2022-04-28" @default.
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- W4224985655 date "2022-05-17" @default.
- W4224985655 modified "2023-09-27" @default.
- W4224985655 title "Synthesis of 6,6‐ and 7,7‐Difluoro‐1‐acetamidopyrrolizidines and Their Oxidation Catalyzed by the Nonheme Fe Oxygenase LolO" @default.
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- W4224985655 doi "https://doi.org/10.1002/cbic.202200081" @default.
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