<?xml version="1.0"?><rdf:RDF xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:edm="http://www.europeana.eu/schemas/edm/" xmlns:wgs84_pos="http://www.w3.org/2003/01/geo/wgs84_pos" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:rdaGr2="http://rdvocab.info/ElementsGr2" xmlns:oai="http://www.openarchives.org/OAI/2.0/" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:ore="http://www.openarchives.org/ore/terms/" xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:dcterms="http://purl.org/dc/terms/"><edm:WebResource rdf:about="http://www.dlib.si/stream/URN:NBN:SI:doc-H645T7JP/577a5243-8351-463b-8f85-4ec07ed6b42b/PDF"><dcterms:extent>206 KB</dcterms:extent></edm:WebResource><edm:WebResource rdf:about="http://www.dlib.si/stream/URN:NBN:SI:doc-H645T7JP/a4e22763-90c8-4864-aad8-4f05e0241642/TEXT"><dcterms:extent>29 KB</dcterms:extent></edm:WebResource><edm:ProvidedCHO rdf:about="URN:NBN:SI:doc-H645T7JP"><dcterms:issued>2026</dcterms:issued><dc:creator>Gobec, Stanislav</dc:creator><dc:contributor>Gobec, Stanislav</dc:contributor><dc:creator>Hrast Rambaher, Martina</dc:creator><dc:contributor>Hrast Rambaher, Martina</dc:contributor><dc:creator>Kavaš, Vid</dc:creator><dc:creator>Lukić, David</dc:creator><dc:format xml:lang="sl">številka:3</dc:format><dc:format xml:lang="sl">letnik:73</dc:format><dc:format xml:lang="sl">str. 554-559</dc:format><dc:identifier>DOI:10.17344/acsi.2026.9857</dc:identifier><dc:identifier>ISSN:1580-3155</dc:identifier><dc:identifier>COBISSID_HOST:288035075</dc:identifier><dc:identifier>URN:URN:NBN:SI:doc-H645T7JP</dc:identifier><dc:language>en</dc:language><dc:publisher xml:lang="sl">Slovensko kemijsko društvo</dc:publisher><dc:source xml:lang="sl">Acta chimica slovenica</dc:source><dc:subject xml:lang="sl">Farmacevtska kemija</dc:subject><dc:subject xml:lang="sl">monociklični ß-laktami</dc:subject><dc:subject xml:lang="en">monocyclic ß-lactams</dc:subject><dc:subject xml:lang="sl">odstranjevanje zaščite s TBDMS</dc:subject><dc:subject xml:lang="sl">presejanje pogojev odstranjevanja zaščite</dc:subject><dc:subject xml:lang="en">screening of deprotection conditions</dc:subject><dc:subject xml:lang="en">TBDMS deprotection</dc:subject><dc:title xml:lang="sl">Screening of deprotection conditions of TBDMS protecting group on ß-lactams|</dc:title><dc:description xml:lang="sl">Monocyclic ß-lactams are valuable scaffolds for the development of novel antibacterial agents, and synthetic flexibility at the C3 position of the ß-lactam ring is of particular interest. In this study, we evaluated multiple procedures for the deprotection of the tertbutyldimethylsilyl (TBDMS) group in model azetidinone derivatives to enable early-stage functionalization of the C3 hydroxyl group. Given the sensitivity of the strained ß-lactam ring and the presence of additional labile functionalities, careful selection of reaction conditions was required. Two optimized deprotection protocols were identified that successfully afforded the corresponding free alcohols, even in the presence of an acid- and base-sensitive dithiocarbamate moiety. In contrast, several literature-reported procedures proved ineffective under the tested conditions. Although the isolated yields were modest, the results demonstrate the feasibility of selective TBDMS removal in structurally complex monocyclic ß-lactam systems. These findings establish a foundation for further optimization and provide a basis for expanding C3 functionalization strategies in the synthesis of novel ß-lactam derivatives</dc:description><dc:description xml:lang="sl">Monociklični ß-laktami so pomembni za razvoj novih protibakterijskih učinkovin, pri čemer je posebej zanimiva sintezna prilagodljivost na položaju C3 ß-laktamskega obroča. V prispevku smo opisali več postopkov za odstranjevanje terc-butil dimetilsilil (TBDMS) zaščitne skupine v modelnih azetidinonskih derivatih, ki omogočijo funkcionalizacijo hidroksilne skupine C3 v zgodnjih fazah sinteze. Zaradi občutljivosti ß-laktamskega obroča in prisotnost dodatnih občutljivih funkcionalnih skupin, smo morali reakcijske pogoje skrbno nadzorovati. Opisali smo dva optimizirana protokola za odstranjevanje zaščitnih skupin, ki sta privedla do ustreznih prostih alkoholov, celo v prisotnosti na kisline in baze občutljive ditiokarbamatne funkcionalne skupine. Več metod, navedenih v literaturi, se je pri testiranih pogojih izkazalo za neučinkovite. Čeprav so bili izkoristki (11–15 %) skromni, rezultati kažejo na izvedljivost selektivnega odstranjevanja TBDMS v strukturno kompleksnih monocikličnih ß-laktamih. Opisane ugotovitve postavljajo temelje za nadaljnjo optimizacijo in funkcionalizacijo položaja C3 pri sintezi novih ß-laktamov</dc:description><edm:type>TEXT</edm:type><dc:type xml:lang="sl">znanstveno časopisje</dc:type><dc:type xml:lang="en">journals</dc:type><dc:type rdf:resource="http://www.wikidata.org/entity/Q361785" /></edm:ProvidedCHO><ore:Aggregation rdf:about="http://www.dlib.si/?URN=URN:NBN:SI:doc-H645T7JP"><edm:aggregatedCHO rdf:resource="URN:NBN:SI:doc-H645T7JP" /><edm:isShownBy rdf:resource="http://www.dlib.si/stream/URN:NBN:SI:doc-H645T7JP/577a5243-8351-463b-8f85-4ec07ed6b42b/PDF" /><edm:rights rdf:resource="http://creativecommons.org/licenses/by/4.0/" /><edm:provider>Slovenian National E-content Aggregator</edm:provider><edm:intermediateProvider xml:lang="en">National and University Library of Slovenia</edm:intermediateProvider><edm:dataProvider xml:lang="sl">Slovensko kemijsko društvo</edm:dataProvider><edm:object rdf:resource="http://www.dlib.si/streamdb/URN:NBN:SI:doc-H645T7JP/maxi/edm" /><edm:isShownAt rdf:resource="http://www.dlib.si/details/URN:NBN:SI:doc-H645T7JP" /></ore:Aggregation></rdf:RDF>