213552-25-1

Upstream product

• 18162-48-6 tert-butyldimethylsilyl chloride 
• 7791-71-1 5'-O-tritylthymidine 
• 50-89-5 thymidine 
• 76-83-5 trityl chloride 

Downstream Products

• 50-89-5 thymidine 

Relevant academic research and scientific papers

Comparative inhibitory activity of 3′- and 5′-functionalized nucleosides on ribonuclease A

Modified nucleosides, molecules, functionalized with various polar groups at different positions have been synthesized to rationalize the impact of structural modification on their inhibitory activity. Agarose gel and precipitation assays indicate their improved inhibitory activity on ribonuclease A (RNase A). Kinetic experiments clearly categorize them as competitive inhibitors of RNase A with improved inhibition constant (Ki) values (37 ± 9, 67 ± 6, and 193±7 μM for compounds 10, 3, and 7, respectively). The preferential hydrogen bonding network formation between His-12 and His-119 of RNase A with the polar carboxylic and amino groups of these compounds has been evidenced from the docking studies. The relationship between structural modifications and inhibitory activity of these compounds is further justified in terms of energetics using PEARLS.

Synthesis of novel carbazoyl linked pyrimidine-pyrimidine and pyrimidine-purine dinucleotide analogues

The synthesis of two backbone modified dinucleotide analogues is described in which the natural phosphodiester linkage is replaced by a 3'-5' carbazoyl linkage. In both cases the bridge was formed through a coupling reaction between an appropriate 3'-carbazoyl nucleoside analogue and an aldehyde nucleoside derivative. It is noteworthy that starting nucleosides 4 could be common materials to obtain the 3'-carbazoyl nucleoside derivatives 2, by means of a simple, previously-described chemoenzymatic procedure, and the aldehyde nucleoside 3, by an oxidation reaction.

Synthesis and Biological Evaluation of 5-Fluoro-2'-deoxyuridine Phosphoramidate Analogs

A series of alkylating phosphoroamidate analogs of 5-fluoro-2'-deoxyuridine has been prepared and their growth inhibitory activity evaluated against murine L1210 leukemia and B16 melanoma cells in vitro.These compounds were designed to undergo intracellular release of the phosphoramidate anions, which it was hoped would function as irreversible inhibitors of thymidylate synthase.The expectation was that binding of the nucleoside moiety would be followed by alkylation of the enzyme via the phosphoramidate.The chloride, bromide, iodide, and tosylate analogs were highlypotent inhibitors of L1210 cell proliferation, with increased inhibition observed at both higher drug concentrations and longer exposure times.Addition of thymidine completely reversed the inhibition for all compounds, suggesting that these compounds are acting via inhibition of thymidylate synthase.Although the nonalkylating morpholine analog 1f was ca. 50-fold less potent than the methyl(chloroethyl)amino compound, the piperidine analog 1g was only 2-fold less potent, confirming that nitrogen basicity may be as important as the presence of an alkylating group.Addition of thymidine reversed the growth inhibition of the morpholine and piperidine analogs, suggesting that these compounds may also undergo intracellular conversion to 5-fluoro-2'-deoxyuridine 5'-monophosphate.The thymidine and deoxyuridine derivatives 2 and 3 showed minimal growth inhibition in the L1210 assay.The alkylating analogs showed modest cytotoxicity against B16 melanoma cells, and the potency of the analogs was more dependent upon the alkylating moiety than on the 5-substituent.