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The incorporation of the isoindole core into the DNA-encoded chemical library is highly desirable for the great potential pharmacological characters exampled by molecules like lenalidomide. Herein, we reported a DNA-compatible protocol for the OPA-mediated transformation of amines into drug-like moieties represented by isoindolinone and thio-2-isoindole, respectively. The high conversion and wide substrate-scope property of our protocol render its feasibility in the manipulation of terminal amines on oligonucleotide conjugates, including “cap-and-catch” purification, sequential synthesis during DEL construction, and on-DNA macrocyclization.

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We have developed a series of DNA-compatible N-heterocycle formation methods utilizing on-DNA vinyl azide as a synthon to obtain two kinds of poly-substituted imidazoles and isoquinolines.