4-(Bromomethyl)-1,2-dichlorobenzene → [1-(3,4-dichloro-benzyl)-1H-pyrrolo[2,3-b]pyridine-3-yl]acetic acid methyl ester

Participants

Reaction Steps

To an ice cold solution of (1H-pyrrolo[2,3-b]pyridine-3-yl)-acetic acid methyl ester (50 mg, 0.26 mmol) in DMF (1 mL), is added BEMP (0.122 mL, 0.42 mmol). The reaction mixture is stirred at ambient temperature for 40 minutes, then 3,4-dichlorobenzyl bromide (0.101 g, 0.42 mmol) is added and the reaction mixture is stirred for 16 hours at ambient temperature. The reaction mixture is poured into ice cold water (40 mL) and extracted with EtOAc, washed with brine, dried (Na2SO4), filtered and evaporated in vacuo. The crude product is purified by column chromatography on silica gel using a pre-packed Isolute™ silica column (2 g) eluting with 1:20 EtOAc/iso-hexane, furnishing [1-(3,4-dichloro-benzyl)-1H-pyrrolo[2,3-b]pyridine-3-yl]-acetic acid methyl ester; MH+=349.

Provenance & Evidence