Photochemical-PromotedCross-Coupling Reaction ofAlkyl Boronate Esters with DNA-Conjugated Aryl Bromides for DNA-EncodedLibrary Synthesis

The C(sp²)–C(sp³) cross-coupling reaction is an effective way to increase the C(sp³) content in compound collections for drug discovery, enhancing molecular diversity and offering a unique chemistry starting point. In this study, we report a mild, DNA-compatible, and off-DNA-inert photochemical cross-coupling reaction inspired by the amino radical transfer strategy. This method demonstrates broad substrate scopes for DNA-encoded library (DEL) constructions, utilizing commonly available structures on DNA and diverse alkyl boronate ester building blocks, which have not been widely applied in the current DEL chemical space.