Abstract We have developed an induced circular dichroism (ICD) probe with a chromophore‐linked alkynyldeoxyribose skeleton for analyzing higher‐order structures of DNA duplexes in the visible‐light region. When CG‐repeated oligonucleotides (ODNs) with the probe at their 5′ ends adopted Z‐form duplexes at a high NaCl concentration, strong ICD signals were observed at the absorptive region of the chromophore. On the other hand, their B‐form duplexes, formed at a low NaCl concentration, produced a faint ICD signal. The specific ICD for the Z‐form duplexes was found to appear only when the chromophores were attached at the 5′ ends of each of the ODNs. Furthermore, the chromophoric alkynylnucleoside residues effectively promoted the B to Z transition of the ODN.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNondestructive Detection of Acetylcholine in Protic Media: Artificial-Signaling Acetylcholine ReceptorsMasahiko Inouye, Kei-ichi Hashimoto, and Kakuzo IsagawaCite this: J. Am. Chem. Soc. 1994, 116, 12, 5517–5518Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10.1021/ja00091a085https://doi.org/10.1021/ja00091a085research-articleACS PublicationsRequest reuse permissionsArticle Views705Altmetric-Citations117LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Abstract Cryptand-type spirobenzopyrans were synthesized. Sensitive and selective colorations of the spirobenzopyrans were observed for alkaline-earth-metal cations.
About turn: The preferred helical sense of the complex formed between glucose and the meta-ethynylpyridine polymer in aqueous methanol is inverted by mutarotation (see picture). The strong circular dichroism effects induced by pure α- and β-D-glucose weakened with time because the diastereomer excess decreased through mutarotation. The transition curve of the ellipticity closely reflected that of the anomer ratio. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z604176_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Co-oligomers involving (1H)-4-pyridone and 4-alkoxypyridine rings were studied, and it was found that their supramolecular transformation was caused by saccharide recognition. In the co-oligomers, pyridone and pyridine rings are alternately linked at their 2,6-position with an acetylene bond. The pyridine rings behave as a hydrogen bonding acceptor, and the pyridone rings and tautomerized 4-pyridinol work as a donor. Pyridine-pyridone-pyridine 3-mer was found to self-dimerize on the basis of vapor pressure osmometry in CHCl(3), and the association constant was obtained as 2.3 x 10(3) M(-1) by (1)H NMR titration. Longer 5-, 7-, 9-, and 11-mer oligomers showed considerable broadening and anisotropy in the (1)H NMR spectra due to self-association. These longer oligomers recognized octyl beta-D-glucopyranoside and changed their form into a chiral helical complex, showing characteristic circular dichroism.
1,1,1,3,3,3-Hexamethyldisilazane (HMDS) was found to be an efficient solvent for Sonogashira reaction.For the synthesis of C-nucleosides, Sonogashira reaction of ethynyldeoxyriboside with halogenated pyrimidine or pyridine derivatives could be improved by the use of an HMDS-DMF mixed solvent.In situ protection of hydroxy and amino groups by the solvent system may play an important role for the improvement.
meta-Ethynylpyridine polymers bearing metal coordination sites associate with alkyl glycoside guests to show induced circular dichroism (ICD) bands. The addition of a Cu(II) ion changed the intensity or the sign of these ICD bands. The changes suggested chiral helicity amplification or inversion of the polymers by Cu(II)-mediated cross-linking at the coordinating side chains.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective coloration of spiro pyridopyrans for guanosine derivativesMasahiko Inouye, Kwangshik Kim, and Teijiro KitaoCite this: J. Am. Chem. Soc. 1992, 114, 2, 778–780Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ja00028a065https://doi.org/10.1021/ja00028a065research-articleACS PublicationsRequest reuse permissionsArticle Views1234Altmetric-Citations64LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts
