Customizable and Regioselective One‐Pot N−H Functionalization of DNA Nucleobases to Create a Library of Nucleobase Derivatives for Biomedical Applications

DNA is one of the most exciting biomolecules in nature for developing supramolecular biofunctional nanoarchitectures owing to the highly specific and selective interactions between complementary Watson‐Crick base pairing. Herein, simple and one‐pot synthetic procedures have been implemented for producing a library of DNA nucleobase derivatives endowed with reactive functional groups for bioconjugation and cross‐linking strategies with other (bio)molecules. Purine and pyrimidine molecules have been regioselectively N−H functionalized either via N‐alkylation, N‐allylation, N‐propargylation or Michael‐type reactions and structurally characterized. The influence of the reaction conditions was assessed and discussed. The in vitro biocompatibility of the native and nucleobase derivatives was evaluated by culturing them with human fibroblasts, revealing their cytocompatibility. The library of nucleobase derivatives holds great promise for being coupled to different biomolecules, including biopolymeric materials, lipids, and peptides, thus potentially leading to modular supramolecular nanobiomaterials for biomedicine. One‐pot synthetic procedures for producing a library of nucleobase derivatives enlisted with reactive functional groups for bioconjugation and cross‐linking reactions with other biomolecules are reported. The nucleobase derivatives bearing either N‐alkyl, N‐propanenitrile, N‐allyl or N‐propargyl terminals are non‐cytotoxic, denoting great promise for biomedical applications.