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- W2952578149 abstract "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 chinense Miller (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 R≠H), leading to two different chemical shifts in the 1H-NMR spectrum due to their diastereotopic characteristics. In the 1H-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." @default.
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- W2952578149 date "2013-08-01" @default.
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- W2952578149 title "New Pyrrole Alkaloids with Bulky<i>N</i>-Alkyl Side Chains Containing Stereogenic Centers from<i>Lycium chinense</i>" @default.
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- W2952578149 doi "https://doi.org/10.1002/hlca.201200608" @default.
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