title: Solid-supported synthesis and click conjugation of 4'-C-alkyne functionalized oligodeoxyribonucleotides.
abstract: 4'-C-[N,N-Di(4-pentyn-1-yl)aminomethyl]thymidine and 4'-C-[N-methyl-N-(4-pentyn-1-yl)aminomethyl]thymidine 3'-(2-cyanoethyl-N,N-diisopropyl)phosphoramidites (1, 2) were synthesized, and one or two such monomers were incorporated into a 15-mer oligodeoxyribonucleotide. After chain assembly, azido-functionalized ligands, including appropriate derivatives of 1,4-phenylenedimethaneamine, mannose, paromamine, and neomycin, were conjugated to the alkynyl groups by the click chemistry on a solid support. The influence of the 4'-modifications on the melting temperature with DNA and 2'-O-methyl RNA targets was studied. Oligonucleotides containing one to four mannose ligands in the central part of the chain (up to two 4'-C-[N,N-di(4-pentyn-1-yl)aminomethyl]thymidine units) form equally stable duplexes with complementary 2'-OMe RNA as the corresponding unmodified DNA sequence. At high salt content, the mannose conjugation is even stabilizing. On using a DNA target, a modest destabilization occurs. All the amino group bearing conjugates stabilized the duplexes, the DNA·DNA duplexes more than the DNA·2'-O-methyl RNA duplexes.
authors.affiliation: Department of Chemistry, University of Turku, Turku, Finland.
authors.forename: Anu
authors.initials: A
authors.lastname: Kiviniemi
authors.forename: Pasi
authors.initials: P
authors.lastname: Virta
authors.forename: Harri
authors.initials: H
authors.lastname: Lönnberg
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D057930:Click Chemistry; D008024:Ligands; D009838:Oligodeoxyribonucleotides / Q000138:chemical synthesis* / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000737:chemistry; D013936:Thymidine / Q000031:analogs & derivatives / Q000737:chemistry; D044366:Transition Temperature
chemical_list: D000480:Alkynes; D008024:Ligands; D009838:Oligodeoxyribonucleotides; D009943:Organophosphorus Compounds; C434331:phosphoramidite; D013936:Thymidine