Synthesis of new thiolated acyclonucleosides with potential anti-HBV activity

Synthesis of 2′,3′-Dideoxynucleosides from 2-(Methylsulfanyl)Uracils

Silylated 2-(methylsulfanyl)uracils were condensed in the presence of TMS triflate with methyl 2,3-dideoxy-5-O-(4-methylbenzoyl)-D-glycero-pentofuranoside (2) to give, after deprotection, the corresponding nucleosides 6a-f and 7a-f.

Synthesis and antimicrobial activity of some cyclic and acyclic nucleosides of thieno[2,3-d]pyrimidines

The reaction of compounds 1, 2, 3, 4, or 13 with 2-chloroethyl methyl ether or 2,3,4,6-tetra-O-acetyl-alpha-D-glucopyranosyl bromide, afforded some acyclic and cyclic nucleosides of thieno[2,3-d]pyrimidine derivatives. Furthermore, cyclic C-nucleosides 24 and 25 were prepared from the reaction of 20, 21 or from 26, 27 with D-glucose. The antimicrobial evaluation of some prepared products showed promising antimicrobial activity.

Synthesis of Pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives for Antiviral Evaluation

6-Amino-3-methyl-4-(4-nitrophenyl)-2,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile (1) was used as a precursor for preparation of some novel 3,7-dimethyl-4-(4-nitrophenyl)-2,4-dihydropyrazolo[4',3':5,6]pyrano[2,3-d]pyrimidine derivatives 3-6, and some of their corresponding N(2)- and C(5)-S-acyclic nucleosides 7 and 8. Furthermore, the preparation of 5-amino-1-[3,7-dimethyl-4-(4-nitrophenyl)-2,4-dihydropyrazolo[4',3':5,6]pyrano[2,3-d]pyrimidin-5-yl]-1H-pyrazole derivatives 10-16 were described. Some of the prepared products were selected and tested for antiviral activity against Herpes Simplex Virus type-1 (HSV-1).

Synthesis and antiviral screening of some thieno[2,3-d]pyrimidine nucleosides

Some cyclic and acyclic nucleosides of thieno[2,3-d]-pyrimidine derivatives were synthesized via the reaction of compounds 1 and 2 or 3 and 4 with 2-chloroethyl methyl ether or 2,3,4, 6-tetra-O-acetyl-alpha-D-glucopyranosyl bromide. Nucleosides 9, 10, 15, and 16 were tested as antiviral agents against herpes simplex virus type-1 (HSV-1) and hepatitis-A virus (HAV). Compound 15 showed the highest effect on HSV-1 than the other three compounds, while the four tested compounds did not show any activity against HAV.