[Br:1][C:2]1[CH:3]=[CH:4][C:5]([NH:12][C:13](=[O:24])[CH2:14][O:15][C:16]2[CH:21]=[CH:20][C:19]([C:22]#[N:23])=[CH:18][CH:17]=2)=[C:6]([CH:11]=1)[C:7](OC)=[O:8].C[Si]([N-][Si](C)(C)C)(C)C.[K+].C(=O)=O.CC(C)=O>C1COCC1>[Br:1][C:2]1[CH:11]=[C:6]2[C:5](=[CH:4][CH:3]=1)[NH:12][C:13](=[O:24])[C:14]([O:15][C:16]1[CH:21]=[CH:20][C:19]([C:22]#[N:23])=[CH:18][CH:17]=1)=[C:7]2[OH:8]To a suspension of methyl 5-bromo-2-(2-(4-cyanophenoxy)acetamido)benzoate (0.240 g, 0.617 mmol, Intermediate 2: step b) in THF (6.65 mL) at −78° C. was added potassium bis(trimethylsilyl)amide (0.5 M in toluene, 3.66 mL, 1.83 mmol) over 1.5 minutes, and the mixture was stirred for 5 minutes. The dry-ice/acetone bath was replaced with wet-ice bath and the reaction was stirred for 1.5 hours. The reaction was then quenched with water and ethyl acetate was added. The organic layer was removed and the aqueous layer was acidified with 2 N HCl (kept pH above 2). An off-white precipitate was formed which was filtered and the solid was dried overnight in the air and 1 hour in an oven at 40° C. to give the title compound.
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