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Beilstein J. Org. Chem. 2014, 10, 752–760, doi:10.3762/bjoc.10.70
Graphical Abstract
Scheme 1: Preparation of enol ethers.
Scheme 2: Reaction of enol ethers with hydrazine hydrate.
Scheme 3: Pyrazoles 5.
Figure 1: Tautomers of 5a.
Figure 2: Tautomers of 5b (R = Me), 5c (R = Et).
Figure 3: Tautomers of 5b (R = Me), 5c (R = Et).
Figure 4: Tautomers of 5d.
Scheme 4: Reactions of hydrazine hydrate with dialkyl alkoxymethylidenemalonates.
Figure 5: Crystal structure and crystal packing of compound 6a.
Figure 6: Key 1H (red), 13C (black) and 15N (blue) NMR chemical shifts (δ, ppm) in isomers A and B of compoun...
Figure 7: DFT optimized isomers of compound 6a. (Distances are in Å, angles are in degrees.)