Dimedone → HCID 178429602, compound

Participants

Reaction Steps

To a solution of dimedone (0.984 g, 4.1 mmole) in hot ethanol (12 ml) was added 3-(4-trifluoromethylphenyl)-4-pyrazolecarboxaldehyde (1.0 g, 4.1 mmole), isopropyl acetoacetate (0.6 ml, 4.1 mmole) and lastly ammonium acetate (0.616 g, 8.0 mmole). The mixture was maintained at reflux for 18 h. No precipitate formed from the reaction. The reaction mixture was stripped of the ethanol in vacuo. The crude material was dissolved in ethyl acetate and washed with water (2×) and the organic phase was separated and stripped in vacuo. The material was then dissolved in ethyl ether and after a few minutes a white precipitate started to form. The white suspension was then filtered over night as it was a slow viscous filtration. The white material was washed with more ether to provide the desired product (1.55 g, 78%) as a white powder. Rf=0.45 in ethyl acetate. 1H NMR (400 MHz; DMSO d6) δ 9.14 (bs, 1H); 8.34 (bd, 2H, J=7.4 Hz); 7.8 (bs, 2H); 7.35 (bs, 1H); 5.05 (bs, 1H); 4.65-4.55 (m, 1H); 3.35 (bs, 1H); 2.52 (bs, 1H); 2.46 (d, 1H, J=16.8 Hz); 2.32 (d, 1H, J=16.8 Hz); 2.23 (s, 3H); 2.20 (d, 1H, J=16.0 Hz); 2.04 (d, 1H, J=16.0 Hz); 1.05 (s, 3H); 0.93 (s, 3H); 0.7 (d, 3H, J=6.2 Hz); 0.55 (s, 3H, J=6.2 Hz). LC MS shows MH+ at 488; 2M+H at 975.

Provenance & Evidence