[Br:1][C:2]1[CH:3]=[CH:4][C:5]([NH:12][C:13](=[O:21])[CH2:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)=[C:6]([CH:11]=1)[C:7]([O:9]C)=O.C[Si]([N-][Si](C)(C)C)(C)C.[Li+].CCCCCC>C1COCC1>[Br:1][C:2]1[CH:11]=[C:6]2[C:5](=[CH:4][CH:3]=1)[NH:12][C:13](=[O:21])[C:14]([C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)=[C:7]2[OH:9]To a solution of methyl 5-bromo-2-(2-phenylacetamido)benzoate (7.71 g, 22.1 mmol, Intermediate 1, step a) in THF (50 mL) at −78° C. was added 1.0 M lithium bis(trimethylsilyl)amide in hexane (48.7 mL, 48.7 mmol) slowly, and the color changed from clear to clear red. The mixture was stirred at −78° C. to room temperature for 4 hours, during which time the color changed to cloudy yellow. The reaction was quenched with water, and acidified with 37% HCl until pH ˜5. The precipitated solid was filtered, washed with water and Et2O, and air dried to give the title compound. More solid was precipitated from the filtrate after standing overnight. The solid was collected by filtering, washing with water and Et2O, and air drying to afford more title compound.
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