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Neste trabalho e apresentada a sintese, em rendimentos razoaveis (50-67%), de novos sistemas biheterociclicos, duas 6-(2-heteroaril)-4-trifluormetil-2-(1H)-pirimidinonas (2a,b) e uma serie de dez 6-(2-heteroaril)-4-trifluormetilpirimidinas (3a,b - 7a,b) a partir da ciclocondensacao de 1,1,1-trifluor-4-(2-heteroaril)-4-metoxi-3-buten-2-onas com ureia e amidinas. As estruturas de todos os compostos foram atribuidas pelos dados de analise elementar, espectrometria de massas e dados de RMN 1 H e 13 C. Os dados de RMN 1 H e 13 C sao mostrados de maneira sistematica. Tambem apresentamos os dados de difracao de raios-X de um monocristal da 2-amino-6-(tien-2-il)-4-trifluormetilpirimidina (5b). The synthesis of biheterocyclic systems 6-(2-furyl)-pyrimidines and 6-(2-thienyl)pyrimidines in reasonable yields (50-67%), two 6-(2-heteroaryl)-4-trifluoromethyl-2-(1H)pyrimidinones (2a,b) and a series of ten 6-(2-heteroaryl)-4-trifluoromethylpyrimidines (3a,b 7a,b) from the cyclocondensation of 1,1,1-trifluoro-4-(2-heteroaryl)-4-methoxy-3-buten-2-ones with urea and amidines is reported. Structures of all compounds have been elucidated by elemental analysis, mass spectrometry and 1 H, 13 C NMR measurements. The 1 H and 13 C NMR data are systematically reported. The X-ray diffraction data for monocrystal from 2-amino-4trifluoromethyl-6-(thien-2-yl)-pyrimidine (5b) are reported.

journal of the brazilian chemical society

Synthesis of 6-(2-furyl) and 6-(2-thienyl)-4-trifluoromethylpyrimidinones and pyrimidines from 4-(2-heteroaryl)-4-methoxy-1,1,1-trifluoro-3-buten-2-ones