Solution phase synthesis of ISIS 2922 (Vitravene) by the modified H-phosphonate approach
作者:Colin B. Reese、Hongbin Yan
DOI:10.1039/b208802a
日期:2002.11.26
The synthesis of Vitravene, a 21-mer oligonucleotide phosphorothioate (d[Gp(s)Cp(s)Gp(s)Tp(s)Tp(s)Tp(s)Gp(s)Cp(s)Tp(s)Cp(s)Tp(s)Tp(s)Cp(s)Tp(s)Tp(s)Cp(s)Tp(s)Tp(s)Gp(s)Cp(s)G]) by the modified H-phosphonate approach in solution is reported. The synthetic strategy adopted involves the use of only four different trimer building blocks. The dimer and trimer blocks are prepared by a novel four component procedure in which the coupling agent (diphenyl phosphorochloridate 5b) and the sulfur-transfer reagent (N-[(2-cyanoethylsulfanyl)succinimide]
19) are added at the same time. Yields both of the building blocks and in the block coupling reactions are very satisfactory. The fully-protected 21-mer 38 is unblocked by a five-step procedure to give Vitravene, which is isolated as its sodium salt.
Vitravene 的合成,一种 21 聚体硫代磷酸酯寡核苷酸 (d[Gp(s)Cp(s)Gp(s)Tp(s)Tp(s)Tp(s)Gp(s)Cp(s)Tp(s) Cp(s)Tp(s)Tp(s)Cp(s)Tp(s)Tp(s)Cp(s)Tp(s)Tp(s)Gp(s)Cp(s)G]) 通过修改报道了溶液中的 H-膦酸盐方法。所采用的合成策略仅涉及使用四种不同的三聚体构建模块。二聚体和三聚体嵌段是通过新型四组分程序制备的,其中偶联剂(二苯基氯代磷酸酯 5b)和硫转移试剂(N-[(2-氰基乙基硫基)琥珀酰亚胺]
19) 同时添加。结构单元和嵌段偶联反应的产率都非常令人满意。通过五步程序解封完全保护的 21-mer 38,得到 Vitravene,并以其钠盐形式分离出来。