Br[CH2:2][C:3]1[CH:17]=[CH:16][C:6]([C:7]([C:9]2[CH:14]=[CH:13][C:12]([Cl:15])=[CH:11][CH:10]=2)=[O:8])=[CH:5][CH:4]=1.[S-:18][C:19]#[N:20].[Na+].C(O)C>C(OCC)(=O)C>[Cl:15][C:12]1[CH:13]=[CH:14][C:9]([C:7]([C:6]2[CH:16]=[CH:17][C:3]([CH2:2][S:18][C:19]#[N:20])=[CH:4][CH:5]=2)=[O:8])=[CH:10][CH:11]=14-bromomethyl-4'-chlorobenzophenone (5.7 g) and sodium thiocyanate (5.5 g) were added to ethanol (50 ml), and the mixture was stirred for one hour at 60° C. The reaction mixture was concentrated, and water was added to the residue. The mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with water and then dried over anhydrous magnesium sulfate. Ethyl acetate was distilled off under reduced pressure. The residual solid was washed with a solvent mixture of n-hexane:ethyl acetate=10:1 to obtain the desired product (2.2 g, melting point: 129° to 131° C., yield:42%).
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