NMR Spectra and Stereochemistry of N-Acetyl and N-Benzoyl Derivatives of Solasodine

Article abstract of DOI:10.1002/mrc.1260290809

N-Acetylation of solasodine gives only one rotameric N-acetyl derivative compared with N-acetyl-3-methylpiperidine, which exists in solution as two equally populated rotamers.The 1H and 13C NMR spectra (CDCl3) of O,N-diacetyl- and O-acetyl-N-benzoylsolasodine indicate significant deviations from F-ring chair geometry.Opening of the F ring of these derivatives in CDCl3 solution at 25 deg C, to give the corresponding furosta-5,20(22)-diene derivatives, was ascertained by NMR spectroscopy.Key Words: Solasodine <(25R)-solasod-5-en-3β-ol> O,N-Diacetylsolasodine O-Acetyl-N-benzoylsolasodine 3β-Acetoxy-26-acetamidofurosta-5,20(22)-diene 3β-Acetoxy-26-benzamidofurosta-5,20(22)-diene