Selective 5′-desilylation of 3′,5′-disilyi AraU derivatives under basic conditions
作者:Loïc Le Hir de Fallois、Jean-Luc Décout、Marc Fontecave
DOI:10.1016/0040-4039(95)02072-1
日期:1995.12
3′,5′-di-tert-butyldimethylsilyl-2,2′-anhydrouridine 3 was hydrolyzed under basic conditions to yield selectively 3′-tert-butyldimethylsilylarabinouridine 5 in 85 % yield. 3′,5′-disilyl-arabinouridine derivatives 4 and 6 also led selectively to 5 under the same conditions. These reactions suggest an intramolecular participation of the 2′-hydroxyl group in the desilylation and can be used to prepare
3',5'-二-叔丁基二甲基-2,2'-脱水尿苷3在碱性条件下水解得到选择性3'-叔-butyldimethylsilylarabinouridine 5以85%的产率。在相同条件下,3',5'-二甲硅烷基-阿拉伯尿苷衍生物4和6也选择性地产生5。这些反应表明2'-羟基在脱甲硅烷基化中的分子内参与,并且可以用于快速且高产率地制备3'-硅烷基araU衍生物。