ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The Common 2′ -deoxypyrimidine and -purine nucleosides, thymidine (4), O4-[2-(4-nitrophenyl)ethyl]-thymidine (17), 2′-deoxy-N4-[2-(4-nitrophenyl)ethoxycarbonyl]cytidine (26), 2′-deoxy-N6-[2-(4-nitrophenyl)-ethoxycarbonyl]adenosine-39, and 2′-deoxy-N2-[2-(4-nitrophenyl)(ethoxycarbonyl]-O6-[2-4-nitrophenyl)ethyl]-guanosine (52) were further protected by the 2-(4-nitrophenyl)ethoxycarbonyl (npeoc) and the 2-(2,4-dinitrophenyl)ethoxycarbonyl (dnpeoc) group at the OH functions of the sugar moiety to form new partially and fully blocked intermediates for nucleoside and nucleotide syntheses. The corresponding 5′-O-monomethoxytrityl derivatives 5, 18, 30, 40, and 56 were also used as starting material to synthesize some other intermediates which were not obtained by direct acylations. In the ribonucleoside series, the 5′ -O-monomethoxytrityl derivatives 14, 36, 49, and 63 reacted with 2-(4-nitrophenyl) ethyl chloroformate (1) to the corresponding 2′,3′-bis-carbonates 15, 37, 50, and 64 which were either detriylated to 16, 38, 51, and 65, respectively, or converted by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) treatment to the 2′,3′-cyclic carbonates 66-69. The newly synthesized compounds were characterized by elemental analyses and UV and 1H-NMR spectra.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19930760122
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