Chemistry and folding of photomodulable peptides – stilbene and thioaurone-type candidates for conformational switches
作者:Máté Erdélyi、Miranda Varedian、Christian Sköld、Ida B. Niklasson、Johanna Nurbo、Åsa Persson、Jonas Bergquist、Adolf Gogoll
DOI:10.1039/b812001c
日期:——
Optimized synthetic strategies for the preparation of photoswitchable molecular scaffolds based on stilbene or on thioaurone chromophores and their conformationally directing properties, as studied by computations and by NMR spectroscopy, are addressed. For the stilbene peptidomimetics 1, 2 and 3, the length of connecting linkers between the chromophore and the peptide strands was varied, resulting in photochromic dipeptidomimetics with various flexibility. Building blocks of higher rigidity, based on para-substituted thioaurone (4 and 6) and meta-substituted thioaurone chromophores (5 and 7) are shown to have a stronger conformationally directing effect. Design, synthesis, theoretical and experimental conformational analyses are presented.
以芪或硫代金酮为发色团的优化合成策略,用于制备光控分子骨架及其构象导向性质,通过计算和核磁共振波谱学进行了研究。对于芪类拟肽1、2和3,连接发色团与肽链之间的连接链长度有所变化,从而产生了具有不同柔韧性的光致变色二肽拟肽。基于对位取代硫代金酮(4和6)和间位取代硫代金酮发色团(5和7)的更高刚性构建单元显示出更强的构象导向效应。介绍了设计、合成、理论和实验构象分析。