Hydrochloric Acid → 6-(2-FURYL)-1,3-DIMETHYL-1H-PYRAZOLO[3,4-B]PYRIDINE-4-CARBOXYLIC ACID

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Reaction Steps

Synthesized using the procedure for 1 except ester 37 was used as the starting material. After the work up and acidifying the aqueous layer with 1N HCl, solid precipitated which was filtered off and dried on high vacuum to provide the title compound (203 mg, 79%) as a beige solid. 100% pure by HPLC. 1H NMR (400 MHz, DMSO-d6) δ 13.91 (s, 1H), 7.91 (s, 1H), 7.85 (s, 1H), 7.33 (d, J=2.9 Hz, 1H), 6.72-6.67 (m, 1H), 3.98 (s, 3H), 2.55 (s, 3H). 13C NMR (100 MHz, DMSO-d6) δ 166.91, 152.73, 152.00, 147.61, 145.67, 140.08, 135.59, 113.13, 112.56, 111.40, 109.74, 33.82, 15.92. ESI MS: m/z 258.0 (M+H)+.

Provenance & Evidence