Thionyl Chloride → 4-Chloro-furo[2,3-b]pyridine-2-carboxylic acid methyl ester

Participants

Reaction Steps

After adding thionyl chloride (8.0 ml) and dimethylformamide (0.08 ml) to 4-oxo-4,7-dihydro-furo[2.3-b]pyridine-2-carboxylic acid methyl ester (2.0 g), the mixture was heated to reflux for 1 hour. After cooling, the mixture was concentrated under reduced pressure and the precipitated crystals were filtered out and washed with tetrahydrofuran and ethyl acetate to obtain the title compound (2.1 g).

Provenance & Evidence