Synthesis and Characterization of Novel Bifunctional Hemithioindigo Chromophores
摘要:
General methods for the synthesis of novel bifunctional hemithioindigo (HT) compounds, e.g., omega-amino acid derivatives, are presented. The photochromic properties of the photoswitches have been characterized by UV-vis and H-1 NMR spectroscopy.
[EN] SUBSTITUTED DIHYDROINDENE-4-CARBOXAMIDES AND ANALOGS THEREOF, AND METHODS USING SAME [FR] DIHYDROINDÈNE-4-CARBOXAMIDES SUBSTITUÉS, LEURS ANALOGUES ET PROCÉDÉS D'UTILISATION CORRESPONDANT
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.
Synthesis of Photoswitchable Hemithioindigo-Based ω-Amino Acids and Application in Boc-Based Peptide Assembly
作者:Karola Rück-Braun、Stephan Herre、Wencke Steinle
DOI:10.1055/s-2005-918461
日期:——
Efficient procedures for the preparation of the N-Boc-protected aldehydes 5a and 5b are described which are valuable precursors for the synthesis of hemithioindigo-based Ï-amino acids and peptides.
In search of visible-light photoresponsive peptide nucleic acids (PNAs) for reversible control of DNA hybridization
作者:Lei Zhang、Greta Linden、Olalla Vázquez
DOI:10.3762/bjoc.15.243
日期:——
changes. In particular, artificial probes activated by visible-light irradiation are highly desired in biological applications. Here, we report two novel types of visible-light photoswitchable peptidenucleicacids (PNAs) based on the molecular transducers: hemithioindigo and tetra-ortho-fluoroazobenzene. Our study reveals that the tetra-ortho-fluoroazobenzene–PNA conjugates have promising properties (fast
The synthesis of novel N-Boc- and N-Fmoc protected hemithioindigo-based ω-aminoacids is described. An approach to modulate the thermal stability of a hemithioindigo subunit is presented. Placing the amino-group in the stilbene part from the para- to meta-position leads to an increase of the half-life of the thermally labile E-form from 19 h to 47 h.
Thirteen hemithioindigo (HT) derivatives bearing alkyl chains are newly synthesized and their photochromism and emission properties are investigated. The Z/E photoisomerisms of these compounds in organicsolvents are essentially in agreement with data reported by Mostoslavskii and Izmail’skii (J. Gen. Chem. USSR, Engl Transl.), 31, 21 (1961), and subsequent papers). At 77 K both the E and Z isomers
新合成了 13 种带有烷基链的半硫靛 (HT) 衍生物,并研究了它们的光致变色和发射性能。这些化合物在有机溶剂中的 Z/E 光异构现象与 Mostoslavskii 和 Izmail'skii (J. Gen. Chem. USSR, Engl Transl.), 31, 21 (1961) 和随后的论文) 报道的数据基本一致。在 77 K 时,HT 生色团的 E 和 Z 异构体都发出强度相当的荧光,而在室温下,仅从 Z 异构体观察到非常微弱的荧光。对 Z/E 光异构化的可重复数量的检查表明,HT 发色团具有显着的固有光疲劳抗性。