Water → HCID 178520043, compound

Participants

Reaction Steps

To 1H-indole-6-carboxylic acid (2.0 g, 12.42 mmol) in water (100 mL) was added NaNO2 (8.56 g, 124.2 mmol). To this suspension was then slowly added dropwise via addition funnel 6N HCL (16 mL). The resulting slurry was allowed to stir at room temperature overnight. The solid precipitate was filtered and washed with water (50 mL) to provide 2.35 g (100%) of 3-formyl-1H-indazole-6-carboxylic acid. 1H NMR (DMSO-d6) δ 14.46 (1H, s), 10.21 (1H, s), 8.26 (1H, s), 8.20 (1H, d, J=8.5Hz), 7.90 (1H, d, J=8.3 Hz). MS (APCI positive) 205 (methyl ester).

Provenance & Evidence