Hydrolytic stability of nucleoside phosphotriesters derived from bis(hydroxymethyl)-1,3-dicarbonyl compounds and their congeners: towards a novel pro-drug strategy for antisense oligonucleotides
作者:Mikko Ora、Esa Mäki、Päivi Poijärvi、Kari Neuvonen、Mikko Oivanen、Harri Lönnberg
DOI:10.1039/b101754n
日期:——
(1b), 2,2-bis(cyano)-3-(4,4′-dimethoxytrityloxy)propyl (1c) or 2-acetyl-2-benzoyl-3-(4,4′-dimethoxytrityloxy)propyl (1d) protecting group have been prepared. Additionally were synthesized the O- and S-esterified phosphoromonothioate analogs of 1b. After removal of the dimethoxytrityl group under acidic conditions, each of the detritylated protecting groups is readily cleaved from the phosphate/thiophosphate
已经制备了衍生自双(羟甲基)-1,3-二羰基化合物及其同类物的四个不同的核苷磷酸二酯保护基,并将其引入5'- O-新戊酰基胸苷3'-(2-甲氧基乙基)磷酸酯及其单硫代酸酯类似物。具有2,2-双(乙氧基羰基)-3-(4,4'-二甲氧基三苯甲基氧基)丙基(1a),2-氰基-2-甲氧基羰基-3-(4,4'-二甲氧基三苯甲基氧基)丙基(1b)的核苷磷酸三酯1,2,2-双(氰基)-3-(4,4'-二甲氧基三苯甲氧基)丙基(1c)或2-乙酰基-2-苯甲酰基-3-(4,4'-二甲氧基三苯甲氧基)丙基(1d)具有准备好了。另外合成了O-和S-酯化的单硫代磷酸酯类似物1b。在酸性条件下除去二甲氧基三苯甲基之后,每个去三苯甲基化的保护基很容易通过建议涉及碱催化的逆醛醇缩合反应并从形成的碳负离子中间体中消除磷酸二酯的反应而从磷酸酯/硫代磷酸酯部分裂解。 。通过HPLC在2-7的pH范围内研究了氢氧根离子催化的裂解动力学。在pH