Abstract
Three pairs of novel enantiomeric pyrrole alkaloids (1a/1b, 2a/2b, 3a/3b) were isolated from the leaves of Solanum rostratum and their structures were determined via NMR analyses and ECD calculation. All the enantiomers displayed different levels of antifeedant and growth-inhibitory activities against Henosepilachna vigintioctomaculata (a noxious herbivore for Solanaceae), especially 1a and 2a. Interestingly, the results showed enantioselectivity, in which that the pyrrole alkaloids with R configuration at C-2′ showed stronger chemical defense function than their enantiomers.
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