The present invention discloses novel methods and solid supports for the synthesis of 3′-amino oligonucleotides. The novel supports are based on an unsubstituted or ring-substituted hydroxymethylbenzoyl linker element wherein the hydroxymethyl group is esterified to a solid phase bound carboxylic acid and the carbonyl group is linked to an amino alcohol as an amide. Oligonucleotides are conveniently synthesized on the novel supports with no modifications in the standard phosphoramidite synthesis scheme. The ester function of the support is cleaved under the alkaline deprotection conditions for oligonucleotides to provide a free hydroxymethyl group that aids in the release of the 3′-amino oligonucleotide products with a free amino group through neighbor group participation. The free amino group of the oligonucleotides is available for further conjugation reactions to haptens, reporter groups, surfaces or other small molecules or biomolecules. The methods provided are particularly mild, do not require any modifications in standard protocols for the synthesis and deprotection of oligonucleotides, provide the 3′-amino oligonucleotides free of side products and do not introduce chiral centers to the oligonucleotides.
本发明揭示了合成3'-
氨基寡核苷酸的新方法和固体支持物。这些新型支持物基于未取代或取代环的羟甲基苯甲酰连接元素,其中羟甲基基团酯化到固相结合的
羧酸上,羰基团与
氨基醇连接形成酰胺。寡核苷酸可以方便地在这些新型支持物上合成,而不需要对标准
磷酰胺合成方案进行修改。支持物的酯功能在碱性去保护条件下被裂解,释放出一个自由的羟甲基基团,有助于通过邻基团参与来释放具有自由
氨基团的3'-
氨基寡核苷酸产物。寡核苷酸的自由
氨基团可用于进一步与半抗原、报告基团、表面或其他小分子或
生物分子进行共轭反应。所提供的方法特别温和,不需要对合成和去保护寡核苷酸的标准方案进行任何修改,提供不带有副产物的3'-
氨基寡核苷酸,并且不会向寡核苷酸引入手性中心。