β-Anomer selectivity in 2′-deoxynucleoside synthesis: A novel approach using an acyl carbamate directing group
作者:Robert J. Young、Sue Shaw-Ponter、George W. Hardy、Gail Mills
DOI:10.1016/s0040-4039(00)78472-3
日期:1994.11
Glycosylation of silylated pyrimidines using a phenyl 2-deoxy-3-O-(N-benzoyl)carbamoyl-1-thio-D-erythro-pentofuranoside yielded 2-deoxy-β-ribonucleosides in good yields with excellent anomeric selectivity. This prototype 3-O-carbamate directing group was readily formed and removed in high yields.
This paper describes the synthesis of acyclic, cyclic, and deoxysugar nucleosides of 5-ethylpyrimidine, i.e., i) 1-(2-hydroxyethoxymethyl), 1-(2-methoxyethoxymethyl), and 1-ethoxyethyl derivatives of 5-ethyl-uracil and 5-ethylcytosine, ii) 5-ethyl-1-(tetrahydro-2H-pyran-2-yl)- and -1-(tetrahydrofuran-2-yl)uracils, and iii) 5-ethyl-2′-deoxyuridine.
Nitrogen Glycosylation Reactions Involving Pyrimidine and Purine Nucleoside Bases with Furanoside Sugars
作者:Lawrence J. Wilson、Michael W. Hager、Yahya A. El-Kattan、Dennis C. Liotta
DOI:10.1055/s-1995-4142
日期:1995.12
Different approaches for the synthesis of nucleoside analogs (potential HIV inhibitors) are described. Starting from a suitably substituted furanose ring, it is demonstrated that a high facial stereocontrol of the glycosylation reaction can be effected. Different reaction conditions including Lewis acid promoted, SN2 displacement and some enzymatic methodologies for the stereoselective synthesis of these compounds are reviewed.
Bis(trimethylsilyl)pyrimidine bases were treated directly with 1, 3-dioxolane (or 2-methyl-1, 3-dioxolane), chlorotrimethylsilane and a metal iodide, such as KI or NaI, in acetonitrile at room temperature to afford acylopyrimidine derivatives, including 2-thiopyrimidine derivatives, in good yields. Introduction of an acyclic chain into 2-thiopyrimidine bases, however, necessitated the use of 2 eq of the reagents.
Nucleosides. 129. Synthesis of antiviral nucleosides: 5-alkenyl-1-(2-deoxy-2-fluoro-.beta.-D-arabinofuranosyl)uracils
作者:Kyoichi A. Watanabe、Tsann Long Su、Uri Reichman、Nancy Greenberg、Carlos Lopez、Jack J. Fox
DOI:10.1021/jm00367a020
日期:1984.1
Synthesis of 1-(2-deoxy-2-fluoro-beta-D-arabinofuranosyl)uracils containing a vinyl (4a), 2-halovinyl (4b-d), or ethyl substituent at C-5 was achieved. These nucleosides were found to be about a log order less active than 2'-fluoro-5-iodo-ara-C (FIAC) against HSV-1, but they are much less cytotoxic against normal human lymphocytes than FIAC. Nucleosides 4a and 4e showed good activity against HSV-1