Sulfuric Acid → 5-Benzyloxy-1H-pyrrolo[2,3-b]pyridine-2-carboxylic acid methyl ester

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Reaction Steps

The suspension of 0.2 g (0.54 mmol) 5-benzyloxy-pyrrolo[2,3-b]pyridine-1,2-dicarboxylic acid 1-tert-butyl ester (intermediate G) and 30 μl of concentrated sulfuric acid in 2 ml methanol was heated under reflux. After 1.5 h another 2 ml methanol and 30 μl of concentrated sulfuric acid were added. The resulting clear solution was refluxed 3 hours and after cooling down to room temperature was poured on saturated sodium bicarbonate solution and extracted three times with ethyl acetate. The combined organic layers were washed with brine, dried over magnesium sulfate, filtered and evaporated to give 0.12 g (78%) of the product as a colorless solid.

Provenance & Evidence