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Beilstein J. Org. Chem. 2022, 18, 133–142, doi:10.3762/bjoc.18.14
Graphical Abstract
Figure 1: FTIR spectra of (a) the Ni–chitosan NPs and (b) bare chitosan.
Figure 2: PXRD data for the Ni–chitosan NPs.
Figure 3: TEM (a and b) and SEM images (c and d) of the Ni–chitosan NPs.
Figure 4: EDX spectrum of the Ni–chitosan NPs.
Figure 5: Synthesis of dialkyl 1,4-dihydropyridine-2,3-dicarboxylate derivatives.
Figure 6: ORTEP representation of product 4a (CCDC 1949329).
Scheme 1: A plausible mechanistic route for the synthesis of C5–C6-unsubstituted 1,4-DHP derivatives using th...
Figure 7: Recycling experiment of the Ni–chitosan nanocatalyst.