Hydrochloric Acid → 1-Acetyl-3,5,7-trimethylpyrazolo[3,4-D]pyrimidine-4,6-dione

Participants

Reaction Conditions

Reaction Steps

A mixture of Step 2 intermediate (8.0 g, 47.01 mmol) and acetic anhydride (40 ml) in dry pyridine (78 ml) were refluxed for 3 h. The reaction mixture was cooled to 0° C. and acidified with 1N HCl (200 ml). The solid obtained was collected by filtration, washed with 1 N HCl (25 ml), water (25 ml) and dried to give 6.9 g of the product as a white solid; 1H NMR (300 MHz, DMSO-d6): δ 2.71 (s, 3H), 2.96 (s, 3H), 3.37 (s, 3H), 3.50 (s, 3H).

Provenance & Evidence