Synthesis and Enzymatic Deprotection of Biodegradably Protected Dinucleoside-2′,5′-monophosphates: 3-(Acetyloxy)-2,2-bis(ethoxycarbonyl)propyl Phosphoesters of 3′-O-(Acyloxymethyl)adenylyl-2′,5′-adenosines
作者:Emilia Kiuru、Mikko Ora、Leonid Beigelman、Lawrence Blatt、Harri Lönnberg
DOI:10.1002/cbdv.201000288
日期:2011.2
first step towards a viable prodrug strategy for short oligoribonucleotides, such as 2-5A and its congeners, adenylyl-2',5'-adenosines bearing a 3-(acetyloxy)-2,2-bis(ethoxycarbonyl)propyl group at the phosphate moiety, and an (acetyloxy)methyl- or a (pivaloyloxy)methyl-protected 3'-OH group of the 2'-linked nucleoside have been prepared. The enzyme-triggered removal of these protecting groups by hog
迈向针对短寡核糖核苷酸(例如2-5A及其同类物)的可行前药策略的第一步,是在末端带有3-(乙酰氧基)-2,2-双(乙氧基羰基)丙基的腺苷基2',5'-腺苷制备磷酸酯部分,并制备2'-连接核苷的(乙酰氧基)甲基或(新戊酰氧基)甲基保护的3'-OH基。已经研究了通过猪肝脏羧酯酶在pH 7.5和37°下用酶触发的方法去除这些保护基。事实证明,(乙酰氧基)甲基对于3'-O-保护来说太不稳定了,它的去除速度比磷酸酯保护基要快,这导致2',5'-到3',5'-异构化。核苷间磷酸酯键。另外,原料意外地转化为5'-O-乙酰化衍生物。(新戊酰氧基)甲基似乎更适合该目的。完全脱保护的2',5'-ApA作为主要产物积累,尽管即使在这种情况下,也会发生原料的异构化。