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Investigation of the MeOH extract obtained from the root of the Ziziphus mauritiana grown in Thailand resulted in the isolation of two 14- and 13-membered cyclic alkaloids, mauritine L (1) and mauritine M (2), and three known cyclopeptide alkaloids, nummularines H (3), B (4) and hemsine A (5). Their structures were elucidated on the basis of extensive NMR spectroscopic analysis. The first single crystal...
Bioassay-guided fractionation of the EtOAc extract of the roots of Thai Ziziphus oenoplia var. brunoniana resulted in the isolation of four new 13-membered cyclopeptide alkaloids of the 5(13) type, ziziphine N–Q. The structures of the new metabolites were elucidated on the basis of spectroscopic analyses and the stereochemical assignments were established by comparison with other related compounds...
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