Phosphorus oxychloride → HCID 178468964, compound

Participants

Reaction Conditions

Reaction Steps

6-Hydroxy-3-methyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid ethyl ester (30.0 g), phosphorous oxychloride (12.6 mL) and 1,8-diazabicyclo[5.4.0]undec-7-ene (22.3 mL) were dissolved in toluene (550 mL) at 0° C. (ice bath), then stirred at 110° C. for 5 h, then cooled to r.t. The mixture was poured into a vigorously stirred solution of potassium acetate (39.9 g) in water (1 l). The aqueous solution was extracted with ethyl acetate, the organic layer was dried over magnesium sulfate and concentrated in vacuo. The crude product was used for the next step without further purification. 28.6 g (88%) of the title compound were obtained.

Provenance & Evidence