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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vestich</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия химических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus, Chemical Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8331</issn><issn pub-type="epub">2524-2342</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8331-2020-56-3-3U-317</article-id><article-id custom-type="elpub" pub-id-type="custom">vestich-599</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРГАНИЧЕСКАЯ ХИМИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORGANIC CHEMISTRY</subject></subj-group></article-categories><title-group><article-title>Синтез лейцинсодержащих циклодипептидов</article-title><trans-title-group xml:lang="en"><trans-title>Synthesis of leucine-based cyclic dipeptides</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гайдукевич</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Haidukevich</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гайдукевич Вероника Александровна - научный сотрудник.</p><p>Ул. Сурганова, 13, 220072, Минск</p></bio><bio xml:lang="en"><p>Veranika A. Haidukevich - Researcher.</p><p>13, Surganov Str., 220072, Minsk</p></bio><email xlink:type="simple">veronika_haid-ukevich@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Попова</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Popova</surname><given-names>L. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Попова Людмила Александровна - старший научный сотрудник.</p></bio><bio xml:lang="en"><p>Ludmila A. Popova - Senior Researcher.</p><p>13, Surganov Str., 220072, Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Курман</surname><given-names>П. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kurman</surname><given-names>P. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курман Петр Владимирович - кандидат химических наук, ведущий научный сотрудник.</p><p>Ул. Акад. В. Ф. Куп-ревича, 5/2, 220141, Минск</p></bio><bio xml:lang="en"><p>Peter V. Kurman - Ph. D. (Chemistry), Leading Researcher.</p><p>5/2, Academician V. F. Kuprevich Str., 220141, Minsk</p></bio><email xlink:type="simple">peter_kurman@tut.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Книжников</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Knizhnikov</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Книжников Валерий Алексеевич - доктор химических наук, заведующий лабораторией.</p><p>Ул. Сурганова, 13, 220072, Минск</p></bio><bio xml:lang="en"><p>Valeriy A. Knizhnikov - D. Sc. (Chemistry), Head of the Laboratory.</p><p>13, Surganov Str., 220072, Minsk</p></bio><email xlink:type="simple">knizh@ifoch.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физико-органической химии, Национальная академия наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Physical Organic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus,</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт биоорганической химии, Национальная академия наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>28</day><month>08</month><year>2020</year></pub-date><volume>56</volume><issue>3</issue><fpage>311</fpage><lpage>317</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Гайдукевич В.А., Попова Л.А., Курман П.В., Книжников В.А., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Гайдукевич В.А., Попова Л.А., Курман П.В., Книжников В.А.</copyright-holder><copyright-holder xml:lang="en">Haidukevich V.A., Popova L.A., Kurman P.V., Knizhnikov V.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestichem.belnauka.by/jour/article/view/599">https://vestichem.belnauka.by/jour/article/view/599</self-uri><abstract><p>3-бензил-6-изобутилпиперазин-2,5-дион [цикло(лейцилфенилаланил)], 3-изобутилпиперазин-2,5-дион [цикло(лейцилглицил)] и 3-(втор-бутил-)-6-изобутил-пиперазин-2,5-дион [цикло(лейцилизолейцин)] получены циклизацией метиловых эфиров трет-бутилоксикарбонильных производных дипептидов, для синтеза которых был использован как карбодиимидный метод образования пептидной связи, так и метод смешанных ангидридов.</p></abstract><trans-abstract xml:lang="en"><p>3-benzyl-6-isobutylpiperazin-2,5-dione [cyclo(leucylphenylalanyl)], 3-isobutylpiperazin-2,5-dione [cyclo(-leucylglycyl)] and 3-(sec-butyl-)-6-isobutyl-piperazine-2,5-dione [cyclo(leucylisoleucine)] have been obtained by cyclization of methyl esters of tert-butyloxycarbonyl derivatives of dipeptides, for the synthesis of which both carbodiimide-promoted peptide bond formation and the mixed anhydride method were used.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>2</kwd><kwd>5-дикетопиперазины</kwd><kwd>синтез</kwd><kwd>цикло(Leu-Gly)</kwd><kwd>цикло(Leu-Ile)</kwd><kwd>цикло(Leu-Phe)</kwd><kwd>трет-бутил-оксикарбонильная аминозащитная группа</kwd><kwd>карбодиимидный метод</kwd><kwd>метод смешанных ангидридов</kwd><kwd>лейцинсодержащие циклодипептиды</kwd></kwd-group><kwd-group xml:lang="en"><kwd>2</kwd><kwd>5-diketopiperazines</kwd><kwd>synthesis</kwd><kwd>cyclo(Leu-Gly)</kwd><kwd>cyclo(Leu-lle)</kwd><kwd>cyclo(Leu-Phe)</kwd><kwd>tert-butyloxycarbonyl amino protecting group</kwd><kwd>carbodiimide method</kwd><kwd>mixed anhydrides method</kwd><kwd>leucine-based cyclic dipeptides</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Prasad, C. 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