Water → 4-Amino-2-[1-(2,3-difluorobenzyl)-6-methyl-1H-pyrazolo[3,4-d]pyrimidin-3-yl]-5,5-dimethyl-5,7-dihydro-6H-pyrrolo[2,3-d]pyrimidin-6-one

Participants

Reaction Steps

400 mg (1.11 mmol) of 1-(2,3-difluorobenzyl)-6-methyl-1H-pyrazolo[3,4-d]pyrimidine-3-carboximidamide were admixed with 3 ml of tert-butanol, 277 mg (1.33 mmol) of methyl 3,3-dicyano-2,2-dimethylpropanoate dissolved in 2 ml of tert-butanol and 175 mg (1.56 mmol) of potassium tert-butoxide, and the mixture was heated to reflux for 24 h. A little water was added and the reaction solution was purified by means of preparative HPLC (eluent: acetonitrile/water, gradient 30:70→95:5). The product-containing fractions were concentrated and the residue was stirred with water/isopropanol. The solids were filtered off and purified again by means of preparative HPLC (eluent: acetonitrile/water with 0.1% hydrochloric acid, gradient 20:80→100:0). 170 mg (35% of theory) of the target compound were obtained.

Provenance & Evidence