V. Kren et al., ASSIGNMENT OF NITROGEN STEREOCHEMISTRY OF AGROCLAVINE AND ELYMOCLAVINE 6-N-OXIDES, Collection of Czechoslovak Chemical Communications, 60(12), 1995, pp. 2165-2169
Both possible 6-N-oxides of agroclavine (I) and elymoclavine (II) were
prepared by hydrogen peroxide oxidation. Their H-1 and C-13 NMR spect
ra were assigned and the conformation of the D ring (half-chair) was d
etermined. Absolute configuration at 6-N was established by NMR and mo
lecular modelling.