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Beilstein J. Org. Chem. 2019, 15, 679–684, doi:10.3762/bjoc.15.62
Graphical Abstract
Scheme 1: Preparation of hydroxyalkynyl substrates from 1-phenyl-1H-pyrazol-3-ol (1).
Scheme 2: Cyclization of hydroxyalkynyl substrates to 2,5-disubstituted 2H-furo[2,3-c]pyrazoles.
Figure 1: a) ORTEP diagram of the asymmetric unit consisting of two independent molecules 4d(A) and 4d(B); b)...
Beilstein J. Org. Chem. 2012, 8, 2223–2229, doi:10.3762/bjoc.8.251
Scheme 1: Intermediate reactions of pyrazole-4-carbaldehyde 1a.
Figure 1: 1H NMR (in italics), 13C NMR and 15N NMR (in bold) chemical shifts of 5d in CDCl3 solution (with nu...