29269-60-1Relevant academic research and scientific papers
Concise and Efficient Access to 5,7-Disubstituted Pyrazolo[1,5-a]pyrimidines by Pd-Catalyzed Sequential Arylation, Alkynylation and SNAr Reaction
Jismy, Badr,Guillaumet, Gérald,Allouchi, Hassan,Akssira, Mohamed,Abarbri, Mohamed
, p. 6168 - 6178 (2017/11/15)
A simple and efficient method for synthesis of 5,7-disubstituted pyrazolo[1,5-a]pyrimidines is reported. The synthetic route involved first a one-pot two-step synthesis of 7-substituted pyrazolo[1,5-a]pyrimidin-5-ones from the reaction of 3-aminopyrazole 1 with activated alkynes. These compounds were used as key intermediates to access, with excellent yields, a library of new 5,7-disubstituted pyrazolo[1,5-a]pyrimidines, which are known for their wide range of biological activities, through C–O bond activation with PyBroP (bromotripyrrolidinophosphonium hexafluorophosphate) as an activator reagent.
