89549-62-2

Upstream product

• 5334-48-5 4-chloro-1-(phenyl)-1H-pyrazolo[3,4-d]pyrimidine 
• 1122-91-4 4-bromo-benzaldehyde 
• 89549-82-6 Benzoic acid (4-bromo-phenyl)-cyano-(1-phenyl-1H-pyrazolo[3,4-d]pyrimidin-4-yl)-methyl ester 
• 89549-54-2 (4-Bromo-phenyl)-(1-phenyl-1H-pyrazolo[3,4-d]pyrimidin-4-yl)-methanone 

Downstream Products

• 89549-72-4 methyl 4-(p-bromophenyl)-4,5-dihydro-1-phenyl-1H-pyrazolo<3,4-d>pyrimidine-4-carboxylate 
• 89549-65-5 4-(4-Bromo-phenyl)-1-phenyl-1H-pyrazolo[3,4-d]pyrimidine 

Relevant academic research and scientific papers

Catalytic action of azolium salts. IV. Preparations of 4-aroylquinazolines and 4-aroyl-1H-pyrazolo[3,4-d]pyrimidines by catalytic action of 1,3-dimethylimidazolium iodide

The ability of 1,3-dimethylimidazolium iodide (1) to catalyze the aroylation of the chloroheteroarenes 4-8 with arenecarbaldehydes 3 as sources of the aroyl groups was examined in order to develop a preparative method of aroylheteroarenes. In the presence

Studies on Pyrazolopyrimidine Derivatives. XIII. Aryl Migration of 4-Aroyl-1H-pyrazolopyrimidines to 4-Aryl-4,5-dihydro-1H-pyrazolopyrimidine-4-carboxylic Acids

When a mixture of 4-aroyl-1-phenyl-1H-pyrazolopyrimidines (3) and sodium hydroxide in dimethyl sulfoxide (DMSO) was stirred for 1 h at room temperature, migration of the aryl group to the 4-position occurred, i.e., the benzilic acid rearrangement,