Phosphate monoesters are synthesized from a mixture of phosphoricacid (1 or 2 equiv) and alcohols (1 equiv) in the presence of tributylamine. The reaction is promoted by nucleophilic bases such as N-alkylimidazole and 4-(N,N-dialkylamino)pyridine. 2',3'-O-Isopropylidene ribonucleosides are selectively converted to their 5'-monophosphates without the protection of amino groups in nucleobases.
A general approach to nucleoside 3′- and 5′- monophosphates
作者:Y. Hayakawa、S. Wakabayashi、T. Nobori、R. Noyori
DOI:10.1016/s0040-4039(00)96095-7
日期:1987.1
Diallyloxyphosphorylation of nucleoside hydroxyls followed by palladium(0)-catalyzed deallylation provides a new, general method for the preparation of the 3′- and 5′-monophosphates.
Microwave-Assisted Syntheses of 2′,3′-<b> <i>O</i> </b>-isopropylidene ribonucleoside 5′-monophosphates
作者:Wang Zhe、Zhao Yu-Fen
DOI:10.1080/10426500701807707
日期:2008.1.14
secondary hydroxy groups of ribonucleosides also react with phosphoric acid, 2′,3′-Oisopropylidene ribonucleosides were used as substrates. The reactions of 2′,3′-O-isopropylidene uridine (1), adenosine (2), cytidine (3), and guanosine (4) with 2 equivalents of phosphoric acid gave their 5′monophosphates selectively in respective yields of 86%, 86%, 71%, and 83%. In contrast, that same yields were obtained