14786-40-4Relevant articles and documents
preparing methods of nobiletin
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Paragraph 0142-0143; 0160-0162, (2021/08/24)
The present invention provides a process for preparing nobiletin. The present invention relates to a method for preparing nobiletin by using a specific reagent.
Nobiletin metabolites: Synthesis and inhibitory activity against matrix metalloproteinase-9 production
Oshitari, Tetsuta,Okuyama, Yuji,Miyata, Yoshiki,Kosano, Hiroshi,Takahashi, Hideyo,Natsugari, Hideaki
, p. 4540 - 4544 (2011/09/12)
A divergent synthesis of nobiletin metabolites was developed through highly oxygenated acetophenone derivative. We used commercially available methyl 3,4,5-trimethoxybenzoate as a starting material for concise preparation of the key intermediate, 2′-hydro
Synthesis and biological evaluation of a series of tangeretin-derived chalcones
Quintin, Jerome,Desrivot, Julie,Thoret, Sylviane,Menez, Patrick Le,Cresteil, Thierry,Lewin, Guy
scheme or table, p. 167 - 169 (2009/04/10)
A series of chalcones polyoxygenated on the ring A (with pentamethoxy or 2′-hydroxy-3′,4′,5′,6′-tetramethoxy substitution patterns) was synthesized from tangeretin, a natural Citrus flavonoid. These chalcones were evaluated for their antiproliferative, ac
Improved, rapid and efficient synthesis of polymethoxyflavones under microwave irradiation and their inhibitory effects on melanogenesis
Tsukayama, Masao,Kawamura, Yasuhiko,Ishizuka, Takaaki,Hayashi, Shinji,Torii, Fumihito
, p. 2775 - 2784 (2007/10/03)
The microwave-assisted methylation of 2,5-dihydroxy-1,3-dimethoxybenzene with (CH3O)2SO2 for 5 min gave easily 1,2,3,5-tetramethoxybenzene, which was converted into pentamethoxybenzene. The microwave-assisted Friedel-Crafts acylation of pentamethoxybenzene in the presence of In(CF3SO3)3 gave pentamethoxyacetophenone for 15 min under solvent-free conditions in high yield. The microwave-assisted cyclization reaction of the diketones, which were synthesized from the acetophenone via three steps under microwave irradiation, gave the desired polymethoxyflavones for 1.5-3 min in high yields. The polymethoxyflavones showed inhibitory effects on melanogenesis in a human melanoma.
13C-Nuclear Magnetic Resonance (NMR) Spectral Studies on Polysubstituted Flavonoids. I. 13C-NMR Spectra of Flavones
Iinuma, Munekazu,Matsuura, Shin,Kusuda, Kousuke
, p. 708 - 716 (2007/10/02)
The 13C-NMR spectra of 61 flavone derivatives were measured in dimethyl sulfoxide.By consideration of the chemical shifts of skeletal carbons, the parameters (α and β values) and correction factor (o value) necessary for calculating their carbon shifts were deduced.The skeletal carbons of polysubstituted flavones and flavonols could easily be assigned by the use of these values and SCS of OMe or OH.The 13C-NMR spectra were confirmed to give useful information that could not be obtained from other spectral data.The data were applied for the structure elucidation of unknown polysubstituted flavones.Keywords - 13C-NMR spectra; polysubstituted flavones; α value; β value; o value; extensive additivity rule