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Microwave-assisted synthesis of oxo-/thioxopyrimidines and tetrazoles linked to furanoses with d-xylo and d-ribo configuration, and to a d-galacto pyranose is reported and compared to conventional methods. Reaction of dialdofuranoses and dialdopyranoses with a β-keto ester and urea or thiourea under microwave irradiation at 300W gave in 10min the target molecules containing the 2-oxo- or 2-thioxo-pyrimidine...
In this work we report the synthesis of the pseudo-C-nucleosides by two different procedures. The starting material used was a pentodialdofuranose and the chain elongation was accomplished by Reformatsky and Wittig reactions. Construction of the pyrazole ring was possible by reaction with a hidrazine derivative followed by cyclization or by 1,3-dipolar cycloaddition with diazometane and treatment...
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