Imidazole → HCID 178437890, compound

Participants

Reaction Steps

A mixture of 1-cyclopentyl-3-ethyl-6-methylsulfonylpyrazolo[3,4-d]pyrimidin-4-one (3.1 g, 0.01 mol) and imidazole (2.1 g, 0.03 mol) was heated at 165°-175° C. for 3.5 hours. The mixture was cooled to room temperature and water (25 ml), followed by acetic acid (3 ml) were added. A precipitate was obtained which was collected by filtration and washed with water. The product was recrystallized from ethanol/ether to afford 2.4 g (81%) of 1-cyclopentyl-3-ethyl-6-(1-imidazolyl)pyrazolo[3,4-d]pyrimidin-4-one as white crystals, m.p. 228°-230° C.

Provenance & Evidence