[CH3:1][N:2]([CH3:6])[C:3](Cl)=[O:4].[OH:7][CH2:8][CH2:9][NH:10][CH2:11][CH2:12][CH2:13][C:14]1[CH:21]=[CH:20][C:17]([C:18]#[N:19])=[CH:16][CH:15]=1.C(N(CC)CC)C>ClCCl.O>[C:18]([C:17]1[CH:20]=[CH:21][C:14]([CH2:13][CH2:12][CH2:11][N:10]([CH2:9][CH2:8][OH:7])[C:3]([N:2]([CH3:6])[CH3:1])=[O:4])=[CH:15][CH:16]=1)#[N:19]N,N-Dimethylcarbamoyl chloride (3.9 g, 0.0368 mol) was added to a mixture of 4-[3-(2-hydroxyethylamino)propyl]benzonitrile (5 g, 0.025 mol; see step (i) above) and triethylamine (3.7 g, 0.368 mol) in dichloromethane (100 mL) at 0° C. Stirring was then continued at room temperature overnight. The reaction mixture was diluted with water and extracted with dichloromethane. The organic layer was washed with water and brine and dried over sodium sulfate. Solvent evaporation under reduced pressure, followed by purification by column chromatography (using 4% methanol in dichloromethane) yielded 7 g of the sub-title compound as a pale yellow, gummy liquid.
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