Journal
HELVETICA CHIMICA ACTA
Volume 96, Issue 8, Pages 1482-1487Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/hlca.201200608
Keywords
Lycium chinense; Alkaloids; Pyrrole alkaloids
Categories
Funding
- Ewha Womans University
- Korea Food and Drug Administration [08182]
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Four new pyrrole alkaloids, methyl 2-[2-formyl-5-(methoxymethyl)-1H-pyrrol-1-yl]propanoate (1), methyl 2-[2-formyl-5-(methoxymethyl)-1H-pyrrol-1-yl]-3-(4-hydroxyphenyl)propanoate (2), dimethyl 2-[2-formyl-5-(methoxymethyl)-1H-pyrrol-1-yl]butanedioate (3), and dimethyl 2-[2-formyl-5-(methoxymethyl)-1H-pyrrol-1-yl]pentanedioate (4), were isolated from the AcOEt extract of the fruits of Lycium chinenseMiller (Solanaceae). The stereogenic center C(2) in the bulky N-alkyl side chain in each of 1-4 seems to hold the H-atoms of nearby CH2 groups, CH2(7) and CH2(3) (if RH), leading to two different chemical shifts in the H-1-NMR spectrum due to their diastereotopic characteristics. In the H-1-NMR data of each of 2-4, the enhancement of HC(2) signal was inhibited by the R group, probably due to steric hindrance, and its chemical shift was influenced by the anisotropy effect. The structures of 1-4 were elucidated by analysis of various spectroscopic data, including 1D- and 2D-NMR.
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