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Beilstein J. Org. Chem. 2018, 14, 2589–2596, doi:10.3762/bjoc.14.236
Graphical Abstract
Scheme 1: Multistep synthesis of steroidal β-ketoesters 4 and 4' from pregnenolone acetate (1) and pregnadien...
Scheme 2: Cyclization of compound 4 with hydrazine hydrate (5a), phenylhydrazine (5b) and methylhydrazine (5c...
Figure 1: 1H NMR spectra of compound 7f in CDCl3 (top; # solvent signal) and in DMSO-d6 (bottom; # solvent si...