Day: November 14, 2022

Strekowski, Lucjan published the artcileHighly regioselective bromination reactions of polymethylpyrimidines, Related Products of pyrimidines, the main research area is methylpyrimidine regioselective bromination; bσomomethylpyrimidine.

Methylpyrimidines I (R, R1 = H, Me; R2 = H, SMe) are brominated at C(5)-Me with NBS in CCl4 and at C4(6)-Me with Br2 in HOAc to give the bromomethyl derivatives in a high yield. The remaining Me group(s) can also be brominated with high regioselectivity. The 2-methylthio substituent is not oxidized under these conditions.

Journal of Organic Chemistry published new progress about Bromination, regioselective. 84755-30-6 belongs to class pyrimidines, name is 4-Methyl-2-(methylthio)pyrimidine-5-carbaldehyde, and the molecular formula is C7H8N2OS, Related Products of pyrimidines.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Homon, Anton A. published the artcileSynthesis of 3-Azabicyclo[3.2.0]heptane-Derived Building Blocks via [3+2] Cycloaddition, Recommanded Product: 4-Chloro-6-(methoxymethyl)pyrimidine, the main research area is azabicyclo heptane derivative; cyclobuteneraboxylic acid ester cycloaddition.

An efficient approach to synthesis of various substituted 3-azabicyclo[3.2.0]heptane-derived building blocks based on [3+2] cycloaddition of cyclobut-1-eneraboxylic acid ester and in situ generated azomethine ylide was developed and applied on multigram scale. The utility of 1,3-disubstituted 3-azabicyclo[3.2.0]heptane scaffold was demonstrated by addnl. structural anal. using exit vector plot (EVP) tool, and tested in parallel synthesis of compound library.

European Journal of Organic Chemistry published new progress about [3+2] Cycloaddition reaction. 3122-84-7 belongs to class pyrimidines, name is 4-Chloro-6-(methoxymethyl)pyrimidine, and the molecular formula is C6H7ClN2O, Recommanded Product: 4-Chloro-6-(methoxymethyl)pyrimidine.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Rao, P. Surya Prakash published the artcileA validated chiral LC method for enantiomeric separation of intermediate of lopinavir by using cellulose based chiral stationary phase, Product Details of C9H16N2O3, the main research area is lopinavir intermediate enantiomer chiral HPLC.

A rapid isocratic chiral LC method was developed for the separation of 2R-(1-Tetrahydro pyrimid-2-onyl)-3-Me butanoic acid (R-THPA) from 2S-(1-Tetrahydro pyrimid-2-onyl)-3-Me butanoic acid. (S-THPA). Good resolution with Rs > 3 was obtained using cellulose based chiral stationary phase, chiralcel OD-H column (250 × 4.6 mm, 5 μm particle size) and n-hexane, ethanol and trifluoroacetic acid (900:100:2, volume/volume) as the mobile phase at ambient temperature Flow rate was kept at 1.2 mL/min-1 and elution was monitored by UV detection at 210 nm. This method allowed for the detection and quantification of R-THPA of levels at 0.5 and 1.5 μg/mL-1 resp. The method was validated following ICH guidelines.

Analytical Chemistry: An Indian Journal published new progress about HPLC chiral stationary phases. 192725-50-1 belongs to class pyrimidines, name is (S)-3-Methyl-2-(2-oxotetrahydropyrimidin-1(2H)-yl)butanoic acid, and the molecular formula is C9H16N2O3, Product Details of C9H16N2O3.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Spalletta, Robert A. published the artcileSpin-trapping free radicals by solvating x-irradiated crystalline pyrimidines, Recommanded Product: 5-Methylcytosinehydrochloride, the main research area is radiolysis uracil cytosine crystal; nitrone spin trap pyrimidine radical; nitrosobutane spin trap pyrimidine radical; ESR spin trapped radical.

Free radicals formed by x-irradiation of polycrystalline pyrimidines (twenty-one uracil and cytosine derivatives) are examined by the ESR of the spin-trapped radicals formed by dissolving polycrystalline samples in aqueous solutions containing Me3CNO or PhCH:N+(O-)CMe3 spin traps. In general, a good correlation is found between the radicals observed in the powder and those trapped in solution Trapping at N(3) is due to H addition to C(6) and not H abstraction from N(3). The 6-yl and N-Me radicals are trapped more efficiently than the 5-yl radical.

Radiation Research published new progress about ESR (electron spin resonance). 58366-64-6 belongs to class pyrimidines, name is 5-Methylcytosinehydrochloride, and the molecular formula is C5H8ClN3O, Recommanded Product: 5-Methylcytosinehydrochloride.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia