Pyridylmethyl Radicals for Enantioselective Alkene Hydroalkylation Using “Ene”-Reductases

Sophie G. Bender, Todd K. Hyster

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Aromatic electron-deficient heterocycles, such as pyridines, are found in many biologically relevant structures, including those with medicinal applications. Methods for their substitution can streamline the synthesis of valuable molecules and allow access to unexplored chemical space. However, enantioselective methods for these derivatizations remain lacking, especially at remote stereocenters. Here, we present a photoenzymatic reaction for the reductive coupling of electron-deficient heterocycles with alkenes using flavin-dependent “ene”-reductases. This transformation results in the generation of a γ-stereocenter with high enantioselectivity. We propose that this light-driven transformation proceeds via excitation of a transient enzyme-substrate complex, enabling the enzyme to access the reductive potential needed for radical initiation when the substrates are bound in the active site. This work represents a stereoselective method for synthesizing derivatives of pyridine and similar heterocycles and an expansion of the substrate capabilities of “ene”-reductases in chemical synthesis.

Original languageEnglish (US)
Pages (from-to)14680-14684
Number of pages5
JournalACS Catalysis
Issue number22
StatePublished - Nov 17 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry


  • asymmetric synthesis
  • biocatalysis
  • photochemistry
  • pyridines
  • radical chemistry


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