نتایج جستجو برای: deuterated pyrimidines
تعداد نتایج: 9012 فیلتر نتایج به سال:
A straightforward and effective strategy for the synthesis of novel 7-cyano-4-imino-3-phenyl-6-(pyrrolidin-1-yl)-2-substituted-3,4-dihydroselenopheno[3,2-d]pyrimidines have been accomplished through a base-promoted cascade addition/cyclization sequence employing phenyl isothiocyanate followed by S-alkylation obtained fused Se-containing heterocyclic framework with various alkyl halides. Free ra...
A novel approach to the synthesis of fully substituted pyrimidine derivatives armed with an oxy-functionalized acetate chain at the ring is described. The manifold uses amidines as the nitrogen source and activated skipped diynes as the electrophilic reactive partners in a coupled domino strategy. In the first domino reaction, two consecutive aza-Michael additions assemble the six-membered ring...
Distribution (partition) of an organic substance between two liquid phases, usually water and an or ganic solvent, plays an important role in extraction, partition chromatography, and various other separa tion processes used in many areas of chemistry. Partition (distribution) coefficient, P, which is the quantity used to characterize the distribution of a solute between two immiscible solven...
An efficient synthesis methodology for a series of tetrazolo[1,5-a]pyrimidines substituted at the 5- and 7-positions from the cyclocondensation reaction [CCC + NCN] was developed. The NCN corresponds to 5-aminotetrazole and CCC to β-enaminone. Two distinct products were observed in accordance with the β-enaminone substituent. When observed in solution, the compounds can be divided into two grou...
Nucleotide bases are ubiquitous in living organisms, but the fate of these compounds in natural environments is poorly understood. Here we studied the metabolism of selected purines and pyrimidines in estuarine bacterial assemblages from the Øresund, Denmark. Depletion of nucleotide bases in the incubations was followed by the appearance of urea. The purine guanine and the catabolic intermediat...
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