[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:10])[CH3:9])=[CH:4][CH:3]=1.Cl.[CH3:12][NH:13][CH3:14].[CH2:15]=O.Cl>CC(C)=O.CCO>[ClH:1].[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:10])[CH2:9][CH2:12][N:13]([CH3:15])[CH3:14])=[CH:4][CH:3]=1To EtOH (80 mL), p-chloroacetophenone (77.3 g, 0.50 mol), dimethylamine hydrochloride (52.7 g, 0.65 mol), paraformaldehyde (19.8 g, 0.66 mol) and concentrated aqueous HCl (1 mL) were added and the mixture was refluxed for 5 h. The mixture was cooled to 40° C., acetone (400 mL) was added, and under stirring the mixture was cooled further to 20° C. The precipitate was filtered, washed with acetone and PA, and air dried to obtain 69.5 g of product which was used without further purification in the subsequent step.
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