反应详情

The mixture of the above obtained methyl [(4Z)-4-(1-ethoxypentylidene)-1-methyl-5-oxo-4,5-dihydro-1H-pyrazol-3-yl]acetate (Compound of Formula (VII), 1.05 g) and 1-pyridin-2-ylmethanamine (0.262 mL) was stirred at room temperature in toluene (25 mL) for 0.5 h. The solvent was removed in vacuo. The resulting residue was dissolved in a minimum of CH2Cl2 and added dropwise to a stirred solution of 200 mL of cyclohexane resulting in the formation of a brown precipitate that was filtered off. This precipitate was proved to be the pure methyl [(4Z)-1-methyl-5-oxo-4-{1-[(pyridin-2-ylmethyl)amino]pentylidene}-4,5-dihydro-1H-pyrazol-3-yl]acetate (1.20 g). Yield 92%. MS (ESI+): 345.4; MS (ESI−): 342.5.

1. additionThe mixture of the
2. customThe solvent was removed in vacuo
3. dissolutionThe resulting residue was dissolved in a minimum of CH2Cl2
4. additionadded dropwise to a stirred solution of 200 mL of cyclohexane resulting in the formation of a brown precipitate that
5. filtrationwas filtered off