申请人:Manoharan Muthiah
公开号:US20050267300A1
公开(公告)日:2005-12-01
The present invention relates to processes and reagents for oligonucleotide synthesis and purification. One aspect of the present invention relates to compounds useful for activating phosphoramidites in oligonucleotide synthesis. Another aspect of the present invention relates to a method of preparing oligonucleotides via the phosphoramidite method using an activator of the invention. Another aspect of the present invention relates to sulfur-transfer agents. In a preferred embodiment, the sulfur-transfer agent is a 3-amino-1,2,4-dithiazolidine-5-one. Another aspect of the present invention relates to a method of preparing a phosphorothioate by treating a phosphite with a sulfur-transfer reagent of the invention. In a preferred embodiment, the sulfur-transfer agent is a 3-amino-1,2,4-dithiazolidine-5-one. Another aspect of the present invention relates to compounds that scavenge acrylonitrile produced during the deprotection of phosphate groups bearing ethylnitrile protecting groups. In a preferred embodiment, the acrylonitrile scavenger is a polymer-bound thiol. Another aspect of the present invention relates to agents used to oxidize a phosphite to a phosphate. In a preferred embodiment, the oxidizing agent is sodium chlorite, chloroamine, or pyridine-N-oxide. Another aspect of the present invention relates to methods of purifying an oligonucleotide by annealing a first single-stranded oligonucleotide and second single-stranded oligonucleotide to form a double-stranded oligonucleotide; and subjecting the double-stranded oligonucleotide to chromatographic purification. In a preferred embodiment, the chromatographic purification is high-performance liquid chromatography.
本发明涉及寡核苷酸合成和纯化的工艺和试剂。本发明的一个方面涉及在寡核苷酸合成中用于活化磷酰胺的化合物。本发明的另一方面涉及一种使用本发明活化剂通过亚磷酰胺法制备寡核苷酸的方法。本发明的另一方面涉及硫转移剂。在一个优选的实施方案中,硫转移剂是 3-氨基-1,2,4-二噻唑烷-5-酮。本发明的另一方面涉及一种通过用本发明的硫转移试剂处理亚磷酸酯来制备硫代磷酸酯的方法。在一个优选的实施方案中,硫转移剂是 3-氨基-1,2,4-二噻唑烷-5-酮。本发明的另一方面涉及清除带有乙腈保护基团的磷酸基团脱保护过程中产生的丙烯腈的化合物。在一个优选的实施方案中,丙烯腈清除剂是一种与聚合物结合的硫醇。本发明的另一方面涉及用于将亚磷酸盐氧化成磷酸酯的制剂。在一个优选的实施方案中,氧化剂为亚氯酸钠、氯胺或吡啶-N-氧化物。本发明的另一方面涉及纯化寡核苷酸的方法,其方法是将第一单链寡核苷酸和第二单链寡核苷酸退火,形成双链寡核苷酸;并将双链寡核苷酸进行色谱纯化。在一个优选的实施方案中,色谱纯化是高效液相色谱法。