反应详情

600 mg of the crude 1-(2-fluorobenzyl)1H-pyrazolo[3,4-b]pyridine-3-carboxamidine hydrochloride (preparable from the amidine 25A by reaction with HCl) are stirred in 30 ml of methanol with 106 mg of sodium methoxide and admixed with 472 mg (1.96 mmol) of ethyl 3-ethoxy-2-trifluoroacetyl-acrylate. The mixture is boiled for 12 hours and the precipitate is then filtered off with suction and washed with ether. This gives 249 mg (27.5% of theory) of crystals.

1. filtrationthe precipitate is then filtered off with suction
2. washwashed with ether