190430-37-6

Upstream product

• 4330-21-6 2-deoxy-3,5-di-O-p-toluoyl-α-D-erythro-pentofuranosyl chloride 
• 190430-36-5 3-bromo-4-methoxy-1H-pyrazolo[3,4-d]pyrimidine 
• 5399-93-9 4-methoxy-1H-pyrazolo[3,4-d]-pyrimidine 
• 90914-41-3 3-bromo-4-chloropyrazolo<3,4-d>pyrimidine 
• 5399-92-8 4-chloro-1H-pyrazolo[3,4-d]pyrimidine 

Downstream Products

• 216958-57-5 7-(2-Phenylethynyl)-8-aza-7-deazaadenine-2'deoxyadenosine 

Relevant academic research and scientific papers

Revisiting Pyrazolo[3,4- d]pyrimidine Nucleosides as Anti- Trypanosoma cruzi and Antileishmanial Agents

Chagas disease and visceral leishmaniasis are two neglected tropical diseases responsible for numerous deaths around the world. For both, current treatments are largely inadequate, resulting in a continued need for new drug discovery. As both kinetoplastid parasites are incapable of de novo purine synthesis, they depend on purine salvage pathways that allow them to acquire and process purines from the host to meet their demands. Purine nucleoside analogues therefore constitute a logical source of potential antiparasitic agents. Earlier optimization efforts of the natural product tubercidin (7-deazaadenosine) involving modifications to the nucleobase 7-position and the ribofuranose 3′-position led to analogues with potent anti-Trypanosoma brucei and anti-Trypanosoma cruzi activities. In this work, we report the design and synthesis of pyrazolo[3,4-d]pyrimidine nucleosides with 3′- and 7-modifications and assess their potential as anti-Trypanosoma cruzi and antileishmanial agents. One compound was selected for in vivo evaluation in an acute Chagas disease mouse model.

Unexpected dehalogenation of 3-bromopyrazolo[3,4-d]pyrimidine nucleosides during nucleobase-anion glycosylation

The anion-glycosylation (KOH, MeCN, TDA-1) of 3-bromopyrazolo[3,4-d]- pyrimidines 4a and 4b with 2-deoxy-3,5-di-O-(p-toluoyl)-α-D-erythro- pentofuranosyl chloride (5) furnishes the regioisomeric N1-β-D-2'- deoxyribonucleosides 6a and 6b together with the dehalogenated N2- regioisomers 8a and 8b, stereoselectively. The dehalogenation takes place after the glycosylation and results from the sensitivity of the N-2 nucleosides toward aqueous base. An addition/elimination mechanism is suggested for the dehalogenation reaction.