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Twelve new 5-[(5-trifluoromethyl-5-hydroxy-4,5-dihydro-1H-pyrazol-1-yl)-1-propan-1-one-3-yl]-2-methyl-7-trifluoromethylpyrazolo[1,5-a]pyrimidines were prepared by cyclocondensation between 2-methyl-7-trifluoromethylpyrazolo[1,5-a]pyrimidine-5-propanoyl hydrazide derived from 2-methyl-5-(methylpropanoate-3-yl)-7-trifluoromethylpyrazolo[1,5-a]pyrimidine and a series of versatile 1,1,1-trifluoro-4-alkoxy-3-alken-2-ones [F3CC(O)C(R2)=C(R1)OMe where R1 = H, Me, (CH2)2CHCMe2, (CH2)2Ph, (CH2)2CO2Me, Ph, 4-MeC6H4, 4-MeOC6H4, EtO and R2 = H; R1, R2 = -(CH2)4-, -(CH2)5-; R1 = Ph and R2 = Me]. The structures of new propionyl-spaced biheterocycles were derived from 1H, 13C, and 19F nuclear magnetic resonance (NMR) spectroscopy and mass spectrometric (MS) data.

journal of the brazilian chemical society

Efficient Synthesis of New Biheterocyclic 5-[(5-Trifluoromethyl-5-hydroxy-4,5-dihydro-1<i>H</i>-pyrazol-1-yl)-1-propan-1-one-3-yl]-2-methyl-7-trifluoromethylpyrazolo[1,5-<i>α</i>]pyrimidines

Efficient Synthesis of New Biheterocyclic 5-[(5-Trifluoromethyl-5-hydroxy-4,5-dihydro-1H-pyrazol-1-yl)-1-propan-1-one-3-yl]-2-methyl-7-trifluoromethylpyrazolo[1,5-α]pyrimidines