2-Benzamidoethyl Group − A Novel Type of Phosphate Protecting Group for Oligonucleotide Synthesis
作者:Andrei P. Guzaev、Muthiah Manoharan
DOI:10.1021/ja0016396
日期:2001.2.1
2-(N-benzoylamino)ethyl group (A-C) were the most stable. For the most reactive group, H, a phosphitylating reagent, bisamidite 60, was synthesized and used in the preparation of four deoxynucleoside phosphoramidites 28 and 65-67, plus the 2'-O-(2-methoxyethyl)-5-methyluridine phosphoramidite 68. All of these novel building blocks were successfully tested in the preparation of natural, 20-mer oligonucleotides
合成了许多 5'-O-(4,4'-二甲氧基三苯甲基) 胸苷 N,N-二异丙基氨基亚磷酰胺,在 P(III) 处用 2-苯甲酰胺乙醇的衍生物保护,并将其掺入合成寡核苷酸中。根据烷基链、酰氨基和苯环上的取代模式,使用浓氢氧化铵去除这些保护基团所需的时间从 55 摄氏度 48 小时到 25 摄氏度 25 分钟不等。 在研究的 11 个组中, 2-[N-异丙基-N-(4-甲氧基苯甲酰基)氨基]乙基-(H)和ω-(硫代苯甲酰基氨基)烷基保护(I和K)最容易去除。2-[N-甲基-N-苯甲酰氨基]乙基(EG)的衍生物表现出中等稳定性,但2-(N-苯甲酰氨基)乙基(AC)的衍生物最稳定。对于反应性最强的基团 H,一种亚磷酸化试剂,bisamidite 60 被合成并用于制备四种脱氧核苷亚磷酰胺 28 和 65-67,以及 2'-O-(2-甲氧基乙基)-5-甲基尿苷亚磷酰胺 68。所有这些新型结构单元都在天然