Synthesis of 4-aryl(hetaryl)pyrazolo[1,5-a]pyrazines by palladium-catalyzed Suzuki–Miyaura cross coupling
Chem. Heterocycl. Compd. 2019, 55 (11), 1070-1074
DOI: 10.1007/s10593-019-02579-2
Hrynyshyn Y.; Musiychuk A.; Tsizorik N.; Bol’but A.; Vovk M.
4-Bromopyrazolo[1,5-a]pyrazines react with aryl(hetaryl)boronic acids in the presence of catalytic amounts of Pd(dppf)Cl2·CH2Cl2 and an excess of Cs2CO3 in the MeCN–H2O, 9:1 solvent system with the formation of 4-aryl(hetaryl)pyrazolo[1,5-a]pyrazines.
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