Deviations from the generality of the ‘mass spectrometric method’ for determining the mode of ester attachment in pyrrolizidine Alkaloids
作者:Martin W. Bredenkamp、Adriaan Wiechers
DOI:10.1016/s0040-4039(00)96369-x
日期:1987.1
The general use of mass spectrometry for determining the mode of esterattachment in pyrrolizidine alkaloids is based on what appears to be an over simplification of complex fragmentation pathways, and seems to produce unreliable results when applied to macrocyclicpyrrolizidine alkaloids.
A new pyrrolizidine alkaloid N-oxide and the revised structure of sceleratine
作者:Martin W. Bredenkamp、Adriaan Wiechers、Petrus H. van Rooyen
DOI:10.1016/s0040-4039(01)80930-8
日期:1985.1
Sceleratine [1] and its N-oxide [2] have been isolated fromSenecio latifolius DC and their structures determined by spectroscopic and chemical methods and X-ray crystallography.