The acetyl derivatives of {\bfseries 1-3} were also prepared ({\bfseries 1a, 2a, 3a}) and identified by NMR and positive FAB mass spectra.
📌 3 Key Takeaways
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Objective & Hypothesis:Three known flavonol glycosides, i.e., kaempferol 3,7-O-\( a \)-L-dirhamnopyranoside ({\bfseries 1}), kaempferol 3-O-\( b \)-D-glucopyranosyl-(1\( \ra \)2)-\( a-L-rhamnopyranoside-7-O-\( a \)-L-rhamnopyranoside ({\bfseries 2}) and kaempferol 3-O-\( a \)-L-rhamnopyranoside-7-O-\( b \)-D-glucopyranosyl-(1\( \ra \)2)-\( a \)-L-rhamnopyranoside ({\bfseries 3}), were isolated for the first time from the flowers of {\itshape Consolida armeniaca}, and the structures of flavonol glycosides were deduced by high field 1D and 2D NMR and FAB-MS spectroscopies.
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Key Findings & Data:Three known flavonol glycosides, i.e., kaempferol 3,7-O-\( a \)-L-dirhamnopyranoside ({\bfseries 1}), kaempferol 3-O-\( b \)-D-glucopyranosyl-(1\( \ra \)2)-\( a-L-rhamnopyranoside-7-O-\( a \)-L-rhamnopyranoside ({\bfseries 2}) and kaempferol 3-O-\( a \)-L-rhamnopyranoside-7-O-\( b \)-D-glucopyranosyl-(1\( \ra \)2)-\( a \)-L-rhamnopyranoside ({\bfseries 3}), were isolated for the first time from the flowers of {\itshape Consolida armeniaca}, and the structures of flavonol glycosides were deduced by high field 1D and 2D NMR and FAB-MS spectroscopies.
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Conclusion & Impact:The acetyl derivatives of {\bfseries 1-3} were also prepared ({\bfseries 1a, 2a, 3a}) and identified by NMR and positive FAB mass spectra.
Three known flavonol glycosides, i.e., kaempferol 3,7-O-\( a \)-L-dirhamnopyranoside ({\bfseries 1}), kaempferol 3-O-\( b \)-D-glucopyranosyl-(1\( \ra \)2)-\( a-L-rhamnopyranoside-7-O-\( a \)-L-rhamnopyranoside ({\bfseries 2}) and kaempferol 3-O-\( a \)-L-rhamnopyranoside-7-O-\( b \)-D-glucopyranosyl-(1\( \ra \)2)-\( a \)-L-rhamnopyranoside ({\bfseries 3}), were isolated for the first time from the flowers of {\itshape Consolida armeniaca}, and the structures of flavonol glycosides were deduced by high field 1D and 2D NMR and FAB-MS spectroscopies. The acetyl derivatives of {\bfseries 1-3} were also prepared ({\bfseries 1a, 2a, 3a}) and identified by NMR and positive FAB mass spectra.
Özet
Three known flavonol glycosides, i.e., kaempferol 3,7-O-\( a \)-L-dirhamnopyranoside ({\bfseries 1}), kaempferol 3-O-\( b \)-D-glucopyranosyl-(1\( \ra \)2)-\( a-L-rhamnopyranoside-7-O-\( a \)-L-rhamnopyranoside ({\bfseries 2}) and kaempferol 3-O-\( a \)-L-rhamnopyranoside-7-O-\( b \)-D-glucopyranosyl-(1\( \ra \)2)-\( a \)-L-rhamnopyranoside ({\bfseries 3}), were isolated for the first time from the flowers of {\itshape Consolida armeniaca}, and the structures of flavonol glycosides were deduced by high field 1D and 2D NMR and FAB-MS spectroscopies. The acetyl derivatives of {\bfseries 1-3} were also prepared ({\bfseries 1a, 2a, 3a}) and identified by NMR and positive FAB mass spectra.