Synthesis and antiviral evaluation of 2'-C-methyl analogues of 5-alkynyl- and 6-alkylfurano- and pyrrolo[2,3-d]pyrimidine ribonucleosides

Continuous-flow retro-Diels-Alder reaction: an efficient method for the preparation of pyrimidinone derivatives

The syntheses of various pyrimidinones as potentially bioactive products by means of the highly controlled continuous-flow retro-Diels-Alder reaction of condensed pyrimidinone derivatives are presented. Noteworthy, the use of this approach allowed us to rapidly screen a selection of conditions and quickly confirm the viability of preparing the desired pyrimidinones in short reaction times. Yields typically higher than those published earlier using conventional batch or microwave processes were achieved.

Two new pyrrolo[2,3-d]pyrimidines (7-deazapurines): ultrasonic-assisted synthesis, experimental and theoretical characterizations as well as antibacterial evaluation

Two new pyrrolo[2,3-d]pyrimidines (7-deazapurines) were synthesized in high yields by the reaction of 2-amino-1-methyl-4,5-diphenyl-1H-pyrrole-3-carbonitrile with triethyl orthoformate followed by cyclocondensation with methyl or benzyl amine in refluxing glacial acetic acid or using ultrasonic irradiation containing a catalytic amount of glacial acetic acid at 60°C. For each product, the correct structural isomer was identified using the FT-IR, 1H NMR, 13C NMR, 2D nuclear Overhauser effect spectroscopy spectral and microanalytical data together with comparison of the experimental and calculated chemical shifts at the B3LYP/6-31+G(d,p) level of theory. Furthermore, the synthesized compounds were evaluated for their antibacterial activity against Gram-positive bacteria (Staphylococcus aureus and Micrococcus luteus) and Gram-negative bacteria (Escherichia coli) by the agar dilution method using 24-well microtiter plates.

A facile one-pot synthesis of aryl-substituted fused pyrimidinones

The convenient synthesis of a series of 3-phenylpyrido[1,2-a]pyrimidinones 4, 3-phenylpyrimido[1,2-c]quinazolinones 7 and 3-phenylpyrazino[1,2-a]pyrimidinones 10 with promising biological activity is presented.

[Bicyclic furano[2,3-D] derivatives of pyrimidine nucleosides--synthesis and antiviral properties]

The methods of synthesis of furano- and pyrrolo[2,3-dlpyrimidine nucleosides as well as structure activity relationship of obtained compounds towards viruses of varicella zoster, hepatitis C, bovine viral diarrhea and some others are reviewed.