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An MS guided fractionation of the alkaloidal constituents of Flueggea virosa has yielded nine new Securinega alkaloid oligomers, fluevirosinines B–J (1–9). The absolute structures of these oligomers have been characterized on the basis of spectroscopic data and biogenetic consideration. Fluevirosinines B–E (1–4) are four tetramers with new connecting sequences or new oligomerizing patterns, and fluevirosinines...
A biosynthesis directed search for alkaloid oligomers from Flueggea virosa returned fluevirosinine A (4) as the first tetramer of the Securinega structure family, flueggenines C (1) and D (2) as two new dimers, and fluevirosine D (3) as a new trimer. Absolute structures were assigned to them on the basis of spectroscopic methods especially 2D NMR and CD data, as well as biogenetic considerations....
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