Facile Deprotection of <i>O</i>-Cbz-Protected Nucleosides by Hydrogenolysis: An Alternative to <i>O</i>-Benzyl Ether-Protected Nucleosides
作者:David C. Johnson、Theodore S. Widlanski
DOI:10.1021/ol048426w
日期:2004.12.1
effective protecting group for nucleosides. Benzyloxycarbamates provide an alternative to traditional benzyl ethers for protection of nucleosidehydroxylgroups, as they are much more labile to hydrogenolysis. Deprotection conditions using transfer hydrogenolysis are described that avoid the reduction of the pyrimidine nucleobase during deblocking of O-Cbz-protected nucleosides. Additionally, an experiment
Efficient synthesis of nucleoside aryloxy phosphoramidate prodrugs utilizing benzyloxycarbonyl protection
作者:Jong Hyun Cho、Franck Amblard、Steven J. Coats、Raymond F. Schinazi
DOI:10.1016/j.tet.2011.05.046
日期:2011.7
An efficient method for the synthesis of nucleoside phosphoramidates prodrugs (6a-f) has been developed that employs a simple protection/deprotection sequence of the nucleoside with benzyloxycarbonyl (Cbz). The coupling reaction of Cbz-protected derivatives (5a-f) with phenyl-(ethoxy-L-alaninyl)-phosphorochloridate (7), followed by Cbz group removal by hydrogenolysis provided the phenyl phosphoramidate ProTides (6a-f) in excellent overall yields. (C) 2011 Elsevier Ltd. All rights reserved.