Pyrrolizidine oximes: a novel new class of dendrobatid alkaloids
摘要:
Analysis of GC-FTIR spectra and reexamination of H-1- and C-13-NMR data led to revised structures for three closely related tricyclic alkaloids from a dendrobatid poison-frog Dendrobates pumilio. The simplest member, 222, is a spiropentano-pyrrolizidine oxime, while 236 is the corresponding O-methyl oxime and 252, a hydroxy-O-methyl oxime.