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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Doklady Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Химия, науки о материалах</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-9535</issn><issn publication-format="electronic">3034-5111</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">651981</article-id><article-id pub-id-type="doi">10.31857/S2686953523600162</article-id><article-id pub-id-type="edn">OWAYCI</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CHEMISTRY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ХИМИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">UNUSUAL TRANSFORMATIONS OF MONO- AND DISACCHARIDE INTERMEDIATES IN THE SYNTHESIS OF OLIGOSACCHARIDES RELATED TO FRAGMENTS OF THE CAPSULAR POLYSACCHARIDE OF <italic>HAEMOPHILUS INFLUENZAE</italic> TYPE E</article-title><trans-title-group xml:lang="ru"><trans-title>Необычные превращения моно- и дисахаридных интермедиатов в синтезе олигосахаридов, родственных фрагментам капсульного полисахарида <italic>Haemophilus influenzae</italic> типа E</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kamneva</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Камнева</surname><given-names>А. А.</given-names></name></name-alternatives><email>nen@ioc.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Yashunsky</surname><given-names>D. V.</given-names></name><name xml:lang="ru"><surname>Яшунский</surname><given-names>Д. В.</given-names></name></name-alternatives><email>nen@ioc.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gerbst</surname><given-names>A. G.</given-names></name><name xml:lang="ru"><surname>Гербст</surname><given-names>А. Г.</given-names></name></name-alternatives><email>nen@ioc.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nifantiev</surname><given-names>N. E.</given-names></name><name xml:lang="ru"><surname>Нифантьев</surname><given-names>Н. Э.</given-names></name></name-alternatives><email>nen@ioc.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">N.D. Zelinsky Institute of Organic Chemistry, Laboratory of Glycoconjugate Chemistry, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт органической химии им. Н.Д. Зелинского Российской академии наук, Лаборатория химии гликоконъюгатов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-03-01" publication-format="electronic"><day>01</day><month>03</month><year>2023</year></pub-date><volume>509</volume><issue>1</issue><fpage>22</fpage><lpage>29</lpage><history><date date-type="received" iso-8601-date="2025-02-02"><day>02</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, А.А. Камнева, Д.В. Яшунский, А.Г. Гербст, Н.Э. Нифантьев</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, А.А. Камнева, Д.В. Яшунский, А.Г. Гербст, Н.Э. Нифантьев</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">А.А. Камнева, Д.В. Яшунский, А.Г. Гербст, Н.Э. Нифантьев</copyright-holder><copyright-holder xml:lang="ru">А.А. Камнева, Д.В. Яшунский, А.Г. Гербст, Н.Э. Нифантьев</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-9535/article/view/651981">https://journals.eco-vector.com/2686-9535/article/view/651981</self-uri><abstract xml:lang="en"><p id="idm45181324612480">In the course of the synthesis of oligosaccharides related to fragments of the capsular polysaccharide of <italic>Haemophilus influenzae</italic> type e, the transformations of various 2-O-trifluoromethanesulfonate derivatives of β-D-glucopyranosides in reactions with an azide anion was studied. It gives the products of both nucleophilic substitution and a rearrangement of the 6-membered pyranose ring with its contraction to the 5-membered one through (О-5–С-2)-cyclization. Their formation was interpreted for the first time using quantum mechanical calculations.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324611360">В ходе синтеза олигосахаридов, родственных фрагментам капсульного полисахарида <italic>Haemophilus influenzae</italic> типа e, изучены превращения различных 2-О-трифторметансульфонатных производных β-D-глюкопиранозидов под действием азид-аниона. Установлено, что при этом образуются продукты как нуклеофильного замещения, так и перегруппировки с сужением пиранозного 6-членного кольца до 5-членного через (О-5–С-2)-циклизацию. Образование этих продуктов впервые интерпретировано с использованием квантово-механических расчетов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>density functional method</kwd><kwd>nucleophilic substitution</kwd><kwd>cycle narrowing</kwd><kwd>transition states</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>метод функционала плотности</kwd><kwd>нуклеофильное замещение</kwd><kwd>сужение цикла</kwd><kwd>переходные состояния</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Jin Z., Romero-Steiner S., Carlone G.M., Robbins J.B., Schneerson R. // Infect. Immun. 2007. V. 75. № 6. P. 2650–2654. https://doi.org/10.1128/IAI.01774-06</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Kelly D.F., Moxon E.R., Pollard A.J. // Immunology. 2004. V. 113. № 2. 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