[NH2:1][C:2]1[CH:14]=[CH:13][CH:12]=[CH:11][C:3]=1[C:4]([O:6][C:7]([CH3:10])([CH3:9])[CH3:8])=[O:5].C(N(CC)CC)C.[Br:22][CH2:23][C:24](Br)=[O:25]>C(Cl)Cl>[C:7]([O:6][C:4]([C:3]1[CH:11]=[CH:12][CH:13]=[CH:14][C:2]=1[NH:1][C:24](=[O:25])[CH2:23][Br:22])=[O:5])([CH3:10])([CH3:9])[CH3:8]To a mixture of tert-butyl 2-aminobenzoate (5.79 g.), triethylamine (3.99 g.) in methylene chloride (100 ml.) was added dropwise bromoacetyl bromide (8.01 g.) over a period of 15 minutes with stirring under ice-cooling at 5° to 10° C. followed by stirring for 1.75 hours at the same temperature. The reaction mixture was washed successively with 1 M aqueous solution of citric acid (50 ml.×2), water a satirated aqueous solution of sodium bicarbonate (25 ml.×2), water and an aqueous solution of sodium chloride, dried over magnesium, treated with activated charcoal and then evaporated to give an oil of the title compound (9.65 g.).
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