Sulfamic Acid → 7-Methoxy-2-methylbenzo[b]furan-4-carboxylic acid

Participants

Reaction Steps

To a well stirred solution of 7-methoxy-2-methylbenzo[b]furan-4-carboxaldehyde (from step 3) (4.0 g, 21.05 mmol) in acetone (40.0 mL) was added a solution of sulphamic acid (2.4 g, 25.26 mmol) in water (10.0 mL) followed by addition of a solution of sodium chlorite (2.8 g, 31.57 mmol) at 5-10° C. Ice cold water (250 mL) was added to reaction mixture and the product separated was filtered and dried at 60-70° C. to give intermediate-4 (3.2 g) as white solid.

Provenance & Evidence