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Repurposing non-heme iron hydroxylases to enable catalytic nitrile installation through an azido group assistance.
Journal of the American Chemical Society 2019 Februrary 14
Three mononuclear non-heme iron dependent enzymes, L-Ile 4-hydroxylase, L-Leu 5-hydroxylase and polyoxin dihydroxylase, are reported to catalyze the hydroxylation of L-isoleucine, L-leucine and L-α-amino-δ-carbamoylhydroxyvaleric acid (ACV). In this study we showed that these enzymes can accommodate various leucine isomers and catalyze regiospecific hydroxylation. Based on these results, as a proof-of-concept, we demonstrated that the outcome of the reaction can be redirected by installation of an assisting group within the substrate. Specifically, instead of canonical hydroxylation, these enzymes can catalyze non-native nitrile group installation when an azido group is introduced. The reaction is likely to proceed through C-H bond activation by an Fe(IV)-oxo spe-cies, followed by azido-directed C≡N bond formation. These results offer a unique opportunity to investigate and expand the reaction repertoire of Fe/2OG enzymes.
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