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Synthesis of 2-substituted-1H-chromeno[4,3-c]pyrazol-4(1H)ones 10–12. Reagents and conditions. (a) Benzyl bromides, DMF, Cs2CO3, 100 °C, 10–12 h, 13 outputs; (b) benzene(alkyl)sulfonyl chlorides, DCM, TEA, 0 °C, 6–8 h, 28 outputs with 33–52% yield; (c) N-alkyl sulfonyl piperazines, HCHO, EtOH, rt, 4–6 h, 26 outputs with 37–65% yield.
