45 新型ビスフラボンの構造とクロモン系化合物へのシフト試薬の利用
スポンサーリンク
概要
- 論文の詳細を見る
Three new types of biflavone are reported: robustaflavone, 6-C-methylamentoflavone and ochnaflavone besides hitherto known four types, amentoflavone (1a), cupressuflavone (2a), agathisflavone (3a) and hinoki-flavone (4a). Robustaflavone was found in the leaves of Agathis robusta and the structure was established in a form of its hexamethyl ether (10), m.p. 305-308°.6-C-methyl-7-O-methylamentoflavone (13) was isolated from the leaves of Cephalotaxus harringtonia as the first example of C-methyl biflavones. Ochnaflavone (OSI, 15), and its mono- (OSII, 16) and di-(OSIII, 17) methyl ethers were isolated from the leaves of Ochna squarrosa (Ochnaceae) as three members of a new type biflavone which has a lingkage between side phenyls (Tab. 4). The structures of these new biflavones were easily elucidated mainly by using a shift reagent, Eu(FOD)_3 in the NMR spectra of their methyl ethers because H-6 showed much larger S-values than those of H-8 (Tab. 1 and 2). The synthesis of two compounds 14 and 20 starting from 18 and 19 respectively confirmed the structure 15 for ochnaflavone. It was also found that the shift reagent is similarly useful in the structure elucidation of isoflavone and xanthone derivatives.
- 天然有機化合物討論会の論文
- 1973-10-01
著者
-
沖川 正善
Faculty Of Pharmaceutical Sciences Nagasaki University
-
河野 信助
Faculty of Pharmaceutical Sciences, Nagasaki University
-
沖川 正善
長崎大學薬學部
-
河野 信助
長崎大學薬學部
-
Rahman W.
Aligarh大學・化学
-
河野 信助
Faculty Of Pharmaceutical Sciences Nagasaki University
関連論文
- Sesquiterpene Lactofnes from the Pericarps of Illicium majus : 2-Oxy Derivatives of Neomajucin and 3,4-Dehydroxyneomajucin
- A NEW TOXIC NEOANISATIN DERIVATIVE FROM THE PERICARPS OF ILLICIUM MAJUS
- Isolation of Three New Sesquiterpene Lactones from the Pericarps of Illicium majus
- A New Sesquiterpene Lactone and Its Glucoside from the Pericarps of Illicium majus
- New Sesqui-neolignan from the Pericarps of Illicium macranthum
- Minor Constituents from the Seeds of Japanese Star-Anise
- 69(PA2-9) 中国産Illicium属植物2種のアニサチン様セスキテルペンラクトン類の化学構造(ポスター発表の部)
- PHOTOCHEMICAL REARRANGEMENT OF PSEUDOANISATIN AS AN α-HYDROXY KETONE
- ボタンボウフウ根から(+)-サミジンの単離について
- ジュズダマ根の成分について
- Studies on the Components of Clerodendron trichotomum THUNB. III. A New Glycoside, Acacetin-7-glucurono-(1→2)-glucuronide from the Leaves
- マニラコパールの成分について
- Atropisomerism of Biflavones. Confirmation of the Enantiomeric Purity of WB1 by Using a Chiral Nuclear Magnetic Resonance Shift Reagent
- 45 新型ビスフラボンの構造とクロモン系化合物へのシフト試薬の利用
- Two New Biflavonyls from Araucaria cunninghamii
- 30 Pseudoanisatinの構造について
- ネズ葉中のビスフラボンについて
- The Isolation of Neojusticin from Justicia procumbens LINN.
- Studies on Monoterpene Glucosides. VIII. Artefacts formed during Extraction of Asperuloside and Paederoside
- Studies on Monoterpene Glucosides. VII. Iridoid Glucosides of Paederia scandens
- セコイアおよびランダイスギ葉中のSequoiaflavoneと部分的脱メチル化によるその生成
- スギ科およびヒノキ科植物葉中のビスフラボンの分布について
- The Partial Demethylation of Flavones. IV. Formation of New Bisflavones, Hinokiflavone-7,7"-dimethyl Ether and Neocryptomerin
- クサギ成分の研究(第2報) : 根の成分について
- The Partial Demethylation of Flavones. III. Preparation of Rhamnetin and 7-O-Methylmyricetin
- The Partial Demethylation of Flavones. II. Formation of Isocryptomerin
- Cryptomerin A and B, Hinokiflavone Methyl Ethers from the Leaves of Cryptomeria japonica
- The Partial Demethylation of Flavones. I. Preparation of Genkwanin
- 薬学の基礎は化学と生物学("薬学の基礎"の概念)
- 19〜2.二重分子フラボノイドの化学構造
- 植物成分の微量化学的研究-10-
- 刈米達夫:松柏類および近縁植物成分の研究 : 特に葉蝋および二重分子フラボンについて