[CH2:1]([O:8][CH2:9][C:10]([NH2:12])=[S:11])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Br[CH2:14][C:15]([C:17]1[CH:22]=[CH:21][C:20]([Cl:23])=[CH:19][CH:18]=1)=O.O>CN(C=O)C>[CH2:1]([O:8][CH2:9][C:10]1[S:11][CH:14]=[C:15]([C:17]2[CH:22]=[CH:21][C:20]([Cl:23])=[CH:19][CH:18]=2)[N:12]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1To the solution of 2-Benzyloxy-thioacetamide (3.0 g, 16.57 mmol) in 3 ml of DMF was added 2-Bromo-1-(4-chloro-phenyl)-ethanone (3.0 g, 12.87 mmol). The reaction mixture was heated at 130° C. for 24 h under nitrogen atmosphere. After the completion of the reaction mixture (TLC monitoring), water (25 mL) was added and extracted with ethyl acetate (3×50 mL). The combined organics was washed with water, brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified over silica gel (230-400 M, 2% EtOAc-Hexane) to get the desired product (2.0 g, 49%). The corresponding cyano derivative was also prepared by the same general method.
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