Absolute configuration of a cyclopeptide alkaloid, sanjoinine-G1, from Zizyphus vulgaris var. spinosus

Article abstract of DOI:10.1016/0031-9422(96)00292-0

A new cyclopeptide alkaloid, sanjoinine-G1, has been isolated from the seeds of Zizyphus vulgaris var. spinosus. The structure and absolute configuration has been established by spectroscopic analysis and the circular dichroism exiton-coupling method, as N-[(S)(N',N')-dimethylphenylalanyll- cyclo[O-(2S,3S)-β-oxyleucyl-(S)-leucyl-(2-mino-(1R)-hydroxyethyl)-p-phenyl].