14181-46-5

Upstream product

• 4401-71-2 1,3-dimethylthymine 
• 3839-31-4 dimethyl(phenyl)silyllithium 
• 4869-46-9 1,3-dimethyl-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidine-5-carbaldehyde 
• 94820-37-8 1,3-Dimethyl-5-(1-phenyl-1H-tetrazol-5-ylsulfanylmethyl)-1H-pyrimidine-2,4-dione 
• 66224-66-6 adenine 

Relevant academic research and scientific papers

Reactivity of dimethylphenylsilyllithium toward 5- and 6-substituted 1,3-dimethyluracil derivatives

Dimethylphenylsilyllithium (PhMe2SiLi) reacts with 5-substituted 1,3-dimethyluracils by selective addition at the electrophilic C-6 position of the uracil ring to give the corresponding 6-dimethylphenylsilyl-5,6-dihydrouracil derivatives. The reaction of PhMe2SiLi with 6-substituted 1,3-dimethyluracils showed a different selectivity, and an unusual addition at the C-5 position was observed. This synthetic procedure appears to be an efficient entry to a new class of highly functionalized 5,6-dihydro-1,3-dimethyluraciIs characterized by the presence of a silicon substituent selectively introduced at the C-5 and C-6 positions of the uracil ring.

Oxidation of 1,3-dimethylthymine with oxone catalyzed by 5,10,15,20-tetrakis (4N-methylpyridiniumyl)porphyrinatomanganese (III) pentaacetate

The reaction of 1,3-dimethylthymine 2 with KHSO5 (oxone) catalyzed by 5, 10, 15, 20-tetrakis-(4N-methylpyridiniumyl)porphyrinatomanganese (III) pentaacetate 1 [T4MPyPMn (III) (OAc)5] in phosphate buffer gives 1,3-dimethyl-5-hydroxymethyluracil 3, 1,3-dimethyl-5-formyluracil 4, 1,3-dimethyluracil-5-carboxylic acid 5, cis-1,3-dimethylthymine-5,6-glycol 6 and 1,3,5-trimethyl-5-hydroxybarbituric acid 8 in different yields depending on the pH of the reaction medium. Oxidation of the 5-methyl group of 1,3-dimethylthymine to 1,3-dimethyl-5-hydroxymethyluracil 3, 1,3-dimethyl-5-formyluracil 4 and the corresponding acid 5 with oxone catalyzed by T4MPyPMn (III) (OAc)5 may be explained by hydrogen abstraction and recombination mechanism, whereas oxidation of 5,6-double bond of thymine to cis-1,3-dimethylthymine-5,6-glycol 6 and 1,3,5-trimethyl-5-hydroxybarbituric acid 8 may be explained either by electron transfer followed by oxygen atom transfer or by the involvement of hydroxy radicals.

Oxidation of nucleic acid related compounds by the peroxodisulfate ion

The treatment of nucleic acid bases, nucleosides, and nucleotides with peroxodisulfate ion in a phosphate buffer solution at pH 7.0 or water at 70-75°C was investigated. The reaction of thymine and 5-methylcytosine nucleosides and nucleotides resulted in the oxidation of the 5-methyl groups. The oxidation products from 1,3-dimethyluracils and the time-course of the reaction of uracils led to two plausible reaction mechanisms for the oxidation of uracils.

Coupling of 1,3-Dimethylthymine and Adenine with Sodium Peroxodisulfate

Heating of a solution of 1,3-dimethylthymine and adenine in water containing sodium peroxodisulfate at 80 deg C resulted in the formation of their coupling products.

Oxidation of Thymines and Uracils with Sodium Peroxodisulfate

Reaction of thymines with Na2S2O8 in water resulted in selective oxidation of the methyl group at 5-position of thymines.Oxidation of thymines with Na2S2O8 in hydrochloric acid gave 5-chloro-6-hydroxy-5,6-dihydrothymines and in acetic acid containing NaCl gave 6-acetoxy-5-chloro-5,6-dihydrothymines which were converted to 6-alkoxy-5-chloro-5,6-dihydrothymines with alcohols.The reaction of uracils also gave similar products together with 5-chlorouracils.

Elimination Reactions of α-Substituted Thymines Derived from Tautomeric Heterocyclic Thiols and Selenols

Tautomeric heterocyclic thiols are readily alkylated by 5-(halomethyl)uracils, giving both S- and N-substituted products.S derivatives such as 19 undergo rapid elimination of thiolate anion in base, whereas the isomeric 6-substituted uracil drivatives such as 3 show no elimination.Kinetic and 13C NMR studies are consistent with an elimination mechanism involving heterocyclic quinone methide intermediate, which can arise from the 5-substituted uracil derivatives but not from the 6-substituted series.The proposed mechanism is further supported by studies of the pH dependency of the elimination reaction and of the effect of substitution in the uracil ring (see Table I and Scheme II).N-Substituted (thione) derivatives such as 36 also undergo base-catalyzed elimination, but a rates some 105 to 106 times slower than those for the corresponding S derivatives when the uracil is unsubstituted on nitrogen.The high sensivity of elimination rate to changes in the leaving group atom is attributed to a transition state in which the connecting methylene group has considerable carbocation character (see Scheme VI).Analogous derivatives (such as 42) of tautomeric heterocyclic selenols have also been prepared, and their elimination kinetics further support this interpretation.