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Protease from Streptomyces griseus (SGP) as a sustainable biocatalyst was successfully applied in the Michael/cyclization reaction between dimedone and aryl or alkyl substituted α,β-unsaturated ketones or ester for the synthesis of 3,4-dihydropyran derivatives. The products were obtained in moderate to excellent yields (46–95%) with certain enantioselectivities (up to 18% ee) for 27 examples. This...
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