[CH3:1][O:2][C:3]1[CH:11]=[CH:10][C:6]([C:7]([NH2:9])=[S:8])=[CH:5][CH:4]=1.C(N(CC)CC)C.Br[CH2:20][C:21](=O)[C:22]([O:24][CH2:25][CH3:26])=[O:23]>C(O)C>[CH2:25]([O:24][C:22]([C:21]1[N:9]=[C:7]([C:6]2[CH:10]=[CH:11][C:3]([O:2][CH3:1])=[CH:4][CH:5]=2)[S:8][CH:20]=1)=[O:23])[CH3:26]To an ice-cold solution of 4-methoxy-thiobenzamide (0.50 g, 2.98 mmol) in ethanol (25 ml) was added triethylamine (0.41 ml, 2.98 mmol) followed by dropwise addition of ethyl bromopyruvate (0.56 ml, 4.40 mmol). The reaction mixture was heated at 65° C. for 12 h. After the completion of the reaction mixture (TLC monitoring), the reaction mixture was evaporated to dryness under reduced pressure, 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 (60-120 M, 10% EtOAc-Hexane) to get the desired product (0.38 g, 48%).
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