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- W4225282457 abstract "Exploiting nature’s catalysts for non-natural transformations that are inaccessible to chemocatalysis is highly desirable but challenging. On the one hand, the widespread nicotinamide-dependent oxidoreductases have not been utilized for single-electron-transfer-induced bimolecular cross-couplings; on the other, the addition of catalytic asymmetric radical conjugate to terminal alkenes remains a challenge owing to strong racemic background reaction and unselective termination of prochiral radical species. Here we report a chemomimetic biocatalysitic approach for construction of alpha-carbonyl stereocentres via an unnatural intermolecular conjugate addition of N-(acyloxy)phthalimides-derived radicals with acceptor-substituted terminal alkenes, by combination of visible-light excitation and nicotinamide-dependent ketoreductases (KREDs). Based on protein crystal structure, we engineered KREDs via a semi-rational mutagenesis strategy to improve reaction outcomes with a small and high-quality variants library. Mechanistic investigations combining wet experiments, crystallographic studies and computational simulations demonstrate that the repurposed biocatalyst can suppress racemic background reaction and unselected side reactions, yielding enantioselectivity that is challenging to achieve by chemocatalysis. Engineering enzymes to perform new-to-nature reactions can address long-standing challenges in synthetic chemistry. Now a ketoreductase has been evolved to undergo a photoinduced single-electron-transfer pathway, thereby achieving an enantioselective Giese-type radical conjugate addition that yields α-chiral esters." @default.
- W4225282457 created "2022-05-04" @default.
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- W4225282457 date "2022-05-02" @default.
- W4225282457 modified "2023-10-04" @default.
- W4225282457 title "Photoinduced chemomimetic biocatalysis for enantioselective intermolecular radical conjugate addition" @default.
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- W4225282457 doi "https://doi.org/10.1038/s41929-022-00777-4" @default.
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