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Computational Investigation of the Mechanism of Diels–Alderase PyrI4
Published Web Location
https://doi.org/10.1021/jacs.0c10813Abstract
We studied the mechanisms of activation and stereoselectivity of a monofunctional Diels-Alderase (PyrI4)-catalyzed intramolecular Diels-Alder reaction that leads to formation of the key spiro-tetramate moiety in the biosynthesis of the pyrroindomycin family of natural products. Key activation effects of PyrI4 include acid catalysis and an induced-fit mechanism that cooperate with the unique "lid" feature of PyrI4 to stabilize the Diels-Alder transition state. PyrI4 enhances the intrinsic Diels-Alder stereoselectivity of the substrate and leads to stereospecific formation of the product.
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