Rac-6-chloro-3-(3-chloro-benzyl)-1,3-dihydro-indol-2-one → 3-Bromo-6-chloro-3-(3-chloro-benzyl)-1,3-dihydro-indol-2-one

Beteiligte Stoffe

Reaktionsschritte

Pyridinium bromide perbromide (21.7 g, 68 mmol) (Aldrich) was added in one portion to a solution of rac-6-chloro-3-(3-chloro-benzyl)-1,3-dihydro-indol-2-one (18 g, 62 mmol) (from example 1b supra) in t-BuOH (400 mL) and water (2 mL) at room temperature with stirring. After stirring at room temperature for 4 h, the mixture was diluted with water (500 mL) and stirred for 1 h. The resulting precipitate was collected and dried to give 22 g of rac-3-bromo-6-chloro-3-(3-chloro-benzyl)-1,3-dihydro-indol-2-one as a pale yellow solid. MS: 371 (M+H)+.

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