Conformer-Independent Ureidoimidazole Motifs-Tools to Probe Conformational and Tautomeric Effects on the Molecular Recognition of Triply Hydrogen-Bonded Heterodimers
作者:Maria L. Pellizzaro、Andrea M. McGhee、Lisa C. Renton、Michael G. Nix、Julie Fisher、W. Bruce Turnbull、Andrew J. Wilson
DOI:10.1002/chem.201102128
日期:2011.12.16
intramolecular hydrogen‐bonded conformations are postulated, both of which present a DDA array that is complementary to appropriate DAA partners. 1D and 2D 1H NMR spectroscopy, isothermaltitrationcalorimetry, and abinitio structure calculations confirm 1 interacts with 2 (Ka≈33000 M−1 in CDCl3) in a conformer‐independent fashion driven by enthalpy. Comparison of the binding behaviour of 1 with hexylamidocytosine
氢键的线性阵列对于“刺激响应”的超分子材料的可逆组装很有用。因此,对于能够以可预测的方式呈现氢键功能的易于合成的基序存在不断的需求,从而出现了高亲和力和高保真度的识别。线性阵列的设计由于具有多种构象和互变异构构型的能力而具有挑战性。在阵列中每增加一个氢键杂原子,可用的互变异构和构象空间就会增加,很难预料到哪里会产生非生产性的构象异构体/互变异构体。本文介绍了有关互补脲基咪唑供体-供体-受体(DDA)阵列的详细研究(1)和酰胺异胞嘧啶供体-受体-受体(DAA)阵列(2)。的具体特征1是两个简并,分子内氢键键合的构象被假定,这两者呈现DDA数组,它是适当的DAA伙伴互补。1D和2D 1 H NMR光谱,等温滴定量热法,和从头结构计算确认1间与相互作用2(ķ一个≈33000 中号-1在CDCl 3中构象异构体无关的方式通过焓驱动)。比较1与己糖胞嘧啶(4)和mid萘啶(3)的结合行为。5)提供了