Macrocyclic spermine alkaloids from Verbascum: The (E/Z)-isomeric pairs (-)-(S)-verbasitrine/(-)-(S)-isoverbasitrine and (+)-(S)-verbametrine/(+)-(S)-isoverbametrine: Isolation, structure elucidation, and synthesis
K. Drandarov et al., Macrocyclic spermine alkaloids from Verbascum: The (E/Z)-isomeric pairs (-)-(S)-verbasitrine/(-)-(S)-isoverbasitrine and (+)-(S)-verbametrine/(+)-(S)-isoverbametrine: Isolation, structure elucidation, and synthesis, HELV CHIM A, 82(2), 1999, pp. 229-237
The isolation and structure elucidation of the 17-membered macrocyclic sper
mine alkaloid!, (-)-(S)-verbasitrine (2). (-_-(S)-isoverbasitrine (4), (+)-
(S)-verbametrine (6), and (+)-(S)-isoverbametrine (8) is presented. The syn
thesis of their racemates is described.