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Beilstein J. Org. Chem. 2019, 15, 1281–1288, doi:10.3762/bjoc.15.126
Graphical Abstract
Scheme 1: An overview of heterocyclic acids used in the Ugi reaction.
Scheme 2: Synthesis of pyrazolopyridine carboxylic acids 4 [45] and 7 [45] in Doebner-type reaction.
Figure 1: Molecular structure of N-(2-(tert-butylamino)-1-(4-chlorophenyl)-2-oxoethyl)-6-(4-methoxyphenyl)-3-...