title: [Synthesis of 5-azido-3-nitro-omega-bromo-acetophenone- a photochemically active bifunctional reagent for the cross-linking of biopolymers].
abstract: The photochemically activatable heterobifunctional reagent 5-azido-3-nitro-omega-bromo-acetophenone (3) was synthesized by condensation of 3,5-dinitrobenzoyl chloride with diethyl malonate, acid-catalyzed decarboxylation of the formed malonester derivative 1 to 3,5-dinitro-acetophenone (2a), selective reduction of one nitro group in 2a to 5-amino-3-nitro-acetophenone (2b) and diazotization to 2c. Nucleophilic displacement of the diazonium group in 2c by sodium azide forms 5-azido-3-nitro-acetophenone (2d) which gives 3 after bromination. Compound 3 is photochemically labile and forms an highly reactive nitrene during ultraviolet irradiation. Since compound 3 is able to alkylate amino- or mercapto-groups of amino acids or nucleosides via its bromoacetyl residue, the bifunctional reagent 3 should cross link proteins or nucleic acids after nitrene generation.
mesh_terms: D000098:Acetophenones / Q000138:chemical synthesis*; D009696:Nucleic Acids; D010777:Photochemistry; D011506:Proteins; D013329:Structure-Activity Relationship; D014466:Ultraviolet Rays
chemical_list: D000098:Acetophenones; D009696:Nucleic Acids; D011506:Proteins
vernacular_title: Synthese von 5-Azido-3-nitro-omega-brom-acetophenon-einem photoaktivierbaren bifunktionellen Reagenz zur Vernetzung von Biopolymeren