cas 90558-96-6, ETHYL 7-METHYL-[1,2,4]TRIAZOLO[1,5-A]PYRIMIDINE-6-CARBOXYLATE

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2-R-7-methyl[1,2,4]triazolo[2,3-a]pyrimidines: Synthesis and structures
Reactions of 5-R-3-amino-1,2,4-triazoles with ethoxymethylideneacetylacetone and ethyl ethoxymethylideneacetoacetate proceeded regioselectively, giving 2-R-7-methyl[1,2,4]triazolo[2,3-a]-pyrimidines in good yields. The compounds obtained were characterized by elemental analysis, 1H NMR spectroscopy, and X-ray diffraction analysis (for ethyl 2-ethylthio-7-methyl[1,2,4]triazolo[2,3-a]pyrimidine-6-carboxylate). The frontier orbitals, the molecular electrostatic potential, and the geometries of the reagent molecules were calculated by the DFT method (B3LYP/6-31G* *).
Shikhaliev,Krylski,Potapov,Nefedov,Sidorenko
experimental part
p. 1268 - 1272
(2009/07/11)

Recyclization of condensed carbethoxypyrimidines accompanied by substitution of a carbon atom into the heterocycle
Condensation in ethanol of ethyl ethoxymethyleneacetoacetate with systems containing an amidine fragment (substituted 3-aminopyrazoles and 3-amino-1,2,4-triazole) gave 6-carbethoxy-7-methylpyrazolo[1,5-a]pyrimidines. Addition of base to solutions of the o
Danagulyan,Mkrtchyan,Panosyan
p. 485 - 491
(2007/10/03)