A regioselective method for the synthesis of ethyl 3,4-dihydrochromeno[3,4-c]pyrazole-1-carboxylates from 2-substituted 3-nitro-2Hchromenes and ethyl diazoacetate in 68–87% yields was developed. This approach involves an AgOAc-catalyzed 1,3-dipolar cycloaddition of ethyl diazoacetate to nitrochromenes followed by elimination of HNO2 by the action of DBU.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2022, 58(11), 646–650
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Bykova, L.S., Kochnev, I.А., Barkov, A.Y. et al. An AgOAc-catalyzed reaction of 3-nitro-2H-chromenes with ethyl diazoacetate: an efficient one-pot synthesis of ethyl 3,4-dihydrochromeno[3,4-c]pyrazole-1-carboxylates. Chem Heterocycl Comp 58, 646–650 (2022). https://doi.org/10.1007/s10593-022-03128-0
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DOI: https://doi.org/10.1007/s10593-022-03128-0