Emerging trends in drug discovery are prompting a renewed interest in natural products as a source of chemical diversity and lead structures. However, owing to the structural complexity of many natural compounds, the synthesis of derivatives is not easily realized. Here, we demonstrate a conceptually new approach using oligonucleotides as aptameric protective groups. These block several functionalities by non-covalent interactions in a complex molecule and enable the highly chemo- and regioselective derivatization (>99%) of natural antibiotics in a single synthetic step with excellent conversions of up to 83%. This technique reveals an important structureâactivity relationship in neamine-based antibiotics and should help both to accelerate the discovery of new biologically active structures and to avoid potentially costly and cumbersome synthetic routes. Selective modifications of structurally complex molecules bearing multiple reactive functional groups often require cumbersome multistep synthetic efforts. Here, aptameric protective groups based on short RNA sequences are described â they bind to neamine antibiotics, simultaneously protecting several functionalities and enabling regio- and chemoselective functionalizations.
新兴的药物发现趋势促使人们重新关注
天然产物作为
化学多样性和先导结构的来源。然而,由于许多天然化合物的结构复杂性,衍
生物的合成并不容易实现。在这里,我们展示了一种概念上新的方法,使用寡核苷酸作为适
配体保护基团。这些基团通过非共价相互作用在复杂分子中阻断多个功能,有助于在单一合成步骤中实现天然抗生素的高
化学选择性和区域选择性衍生化(>99%),转换率高达83%。该技术揭示了基于新霉素抗生素的重要结构-活性关系,并应有助于加速新
生物活性结构的发现,避免潜在成本高昂且繁琐的合成路线。对具有多个反应性功能团的结构复杂分子的选择性修饰通常需要繁琐的多步合成努力。在这里,介绍了基于短RNA序列的适
配体保护基团——它们与新霉素抗生素结合,同时保护多个功能团,使区域和
化学选择性官能化成为可能。