1,3-Dipolar cycloaddition of a bicyclic sydnone to a propargylic acid amide affords 4,5,6,7-tetra-hydropyrazolo[1,5-a]pyridine-2,6- and −3,6-dicarboxylic acid monoamides which are further converted to corresponding differentiated diamides.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No.7, 992–997, July, 2011.
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Erdmane, E., Zemribo, R. Preparation of differentiated diamides of 4,5,6,7-tetrahydropyrazolo[1,5-a]pyridine-2,6- and −3,6-dicarboxylic acids suitable for parallel synthesis. Chem Heterocycl Comp 47, 811–816 (2011). https://doi.org/10.1007/s10593-011-0840-y
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DOI: https://doi.org/10.1007/s10593-011-0840-y