[3,4-b]pyridine derivatives were synthesized by the reaction of 3-acylcoumarin with 5-aminopyrazole catalyzed by silica sulfuric acid under microwave irradiation. This method has the advantages of short reaction times (20~30 min), excellent selectivity, good yields, and simple operation as well as environmental friendly. The structures of the products were identified by IR, NMR, and HRMS spectra.
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