Water → 1-(4-Methoxybenzyl)-1H-pyrrolo[2,3-b]pyridine-5-carboxylic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a stirred cooled 0° C. suspension of NaH (272 mg, 6.81 mmol) in DMF (23 mL) was added 1H-pyrrolo[2,3-b]pyridine-5-carboxylic acid methyl ester (400 mg, 2.27 mmol). After 5 min, PMBBr (548 mg, 2.72 mmol) and KI (377 mg, 2.27 mmol) were added and the reaction mixture was allowed to warm to room temperature and stirring was continued overnight. The following day, water was added to quench the remaining Nail and the aqueous mixture was washed with EtOAc, which was discarded. The aqueous phase was collected and carefully acidified (pH ˜3) before extraction with EtOAc. The combined organics were dried and evaporated to afford 1-(4-methoxy-benzyl)-1H-pyrrolo[2,3-b]pyridine-5-carboxylic acid (160 mg, 0.57 mmol, 25% yield). ES MS (M+H+)=283.

Herkunft & Nachweise