Potassium Hydroxide → 7-Amino-2-(furan-2-yl)thieno[2,3-b]pyrazine-6-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A suspension of ethyl 7-amino-2-(furan-2-yl)thieno[2,3-b]pyrazine-6-carboxylate 58 (100 mg, 0.346 mmol) and potassium hydroxide (97 mg, 1.728 mmol) in ethanol (5 mL) and water (1 mL) was stirred at 70° C. for 1 h. Quenched in ice cold citric acid solution. The resulting precipitate was collected, washed with water and dried to 7-amino-2-(furan-2-yl)thieno[2,3-b]pyrazine-6-carboxylic acid 59 (66 mg, 73.1%). (m/z)=262 (M+H)+.

Provenance & Evidence