p-Fluoronitrobenzene → 3-iodo-1-(4-nitrophenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

Participants

Reaction Conditions

Reaction Steps

A suspension of 3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine (2.00 g, 7.66 mmol) in dimethylformamide (40 mL) was treated with cesium carbonate (3.74 g, 11.49 mmol) and p-fluoronitrobenzene (1.08 g, 7.66 mmol). The reaction mixture stirred at 80° C. for 5 h under a nitrogen atmosphere. The reaction mixture was added to ice. The precipitate was filtered and washed with water. The product, 4-amino-1-[4-nitrophenyl]-3-iodo-1H-pyrazolo[3,4-d]pyrimidine, was dried on the lyophilizer overnight to give 2.55 g (87%). 1H NMR (DMSO-d6, 400 MHz) δ 8.4952-8.4720 (m, 2H), 8.4142-8.3654 (m, 3H); LCMS (Perkin Elmer, Pecosphere C18 column, 3 um particle size, 33×4.6 mm; 100% 50 mM ammonium Acetate in Water to 100% Acetonitrile over 5 min, 3.0 to 3.5 mil/min) tR=3.73 min (100%) M+ 380.6.

Provenance & Evidence