Potassium tert-butoxide → Ethyl 1-amino-6-cyclopropyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylate

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Reaction Steps

Ethyl 6-cyclopropyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylate (200 mg, 0.865 mmol) was dissolved in N-Methyl-2-pyrrolidone (NMP) (8 mL), followed by addition of potassium tert-butoxide (116 mg, 1.038 mmol). After 20 minutes stirring, O-{[4-(methyloxy)phenyl]carbonyl}hydroxylamine 1-[(aminooxy)carbonyl]-4-(methyloxy)benzene (289 mg, 1.730 mmol) was added and the mixture stirred at room temperature for 16 h. The contents were diluted with EtOAc, and then washed with brine, and saturated NaHCO3. The organic phase was dried over MgSO4, filtered, and concentrated in vacuo. The crude product was purified via silica gel chromatography (eluent: 0 to 50% EtOAc). The final product as collected as 106 mg (50%). LCMS E-S (M+H)=274.4. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.00-1.14 (m, 4 H), 1.41 (t, J=7.07 Hz, 3 H), 2.34-2.47 (m, 1 H), 4.44 (q, J=7.07 Hz, 2 H), 6.39 (s, 2 H), 7.64 (s, 1 H), 8.09 (s, 1 H).

Provenance & Evidence