Deprotection of α-imidazole/benzimidazole ribonucleosides by catalytic carbon tetrabromide initiated photolysis
摘要:
Several protected benzimidazole and imidazole alpha-ribonucleosides were deprotected in excellent yield Lit ambient temperature using CBr4 initiated photolysis in methanol at ambient temperature. No selectivity was observed and both trityl and isopropylidene groups were deprotected Under the reaction conditions. (c) 2005 Elsevier Ltd. All rights reserved.
Regio- and Stereoselective Glycosylation: Synthesis of 5-Haloimidazole α-Ribonucleosides
作者:Tilak Chandra、Xiang Zou、Edward J. Valente、Kenneth L. Brown
DOI:10.1021/jo060087s
日期:2006.6.1
We describe the synthesis of novel 5-haloimidazole ribonucleosides as precursors of modified cobalamins. A regio- and stereoselectiveglycosylation of protected ribose with silylated 4(5)-haloimidazoles produces 5-haloimidazole ribonucleosides predominantly in the α-configuration (60−75%) without any 4-substituted imidazole ribonucleoside. The structure of the 5-fluoroimidazole ribonucleoside was confirmed
Deprotection of α-imidazole/benzimidazole ribonucleosides by catalytic carbon tetrabromide initiated photolysis
作者:Tilak Chandra、Kenneth L. Brown
DOI:10.1016/j.tetlet.2005.09.180
日期:2005.12
Several protected benzimidazole and imidazole alpha-ribonucleosides were deprotected in excellent yield Lit ambient temperature using CBr4 initiated photolysis in methanol at ambient temperature. No selectivity was observed and both trityl and isopropylidene groups were deprotected Under the reaction conditions. (c) 2005 Elsevier Ltd. All rights reserved.