18281-92-0Relevant academic research and scientific papers
CHEMICAL EXAMINATION OF THE ROOTS OF TERMINALIA ARJUNA - THE STRUCTURES OF ARJUNOSIDE III AND ARJUNOSIDE IV, TWO NEW TRITERPENOID GLYCOSIDES
Anjaneyulu, A. S. R.,Prasad, A. V. Rama
, p. 2057 - 2060 (1982)
The non-phenolic fraction of the alcoholic extract of the root bark of Terminalia arjuna yielded two new triterpenoid glycosides, arjunoside III and arjunoside IV in addition to arjunglucoside I and arjunetin.The structure of arjunoside II was established as the 28-β-D(+)-glucuronopyranoside of arjunic acid by a study of its chemical and spectroscopic (1H and 13C NMR) data.Arjunoside IV was shown to be the 3-O-α-L(-)-rhamnoside of arjunic acid.Leucocyanidin, ellagic acid and gallic acid have been isolated from the phenolic part of the root extract.Key Word Index - Terminalia arjuna; Combretaceae; arjunoside III; arjunoside V; triterpenoid glycosides.
Current perspectives on microwave-enhanced reactions of monosaccharides promoted by heterogeneous catalysts
Richel, Aurore,Laurent, Pascal,Wathelet, Bernard,Wathelet, Jean-Paul,Paquot, Michel
scheme or table, p. 141 - 147 (2012/02/04)
Involvement of heterogeneous catalysts as promoters of carbohydrate conversions, in synergy with microwaves as the heating source, is reported. This paper deals with the application of ion-exchange resins, zeolites, clays and metal oxides as convenient mediators for key transformations of carbohydrates. A special emphasis is placed on the use of (doped) mineral supports, in solventless conditions, as clean promoters in combination with microwave dielectric heating.
Design and synthesis by click triazole formation of paclitaxel mimics with simplified core and side-chain structures
Manach, Claire Le,Baron, Aurélie,Guillot, Régis,Vauzeilles, Boris,Beau, Jean-Marie
scheme or table, p. 1462 - 1465 (2011/06/10)
A library of paclitaxel (taxol) mimics was obtained by a straightforward strategy involving rational design and an efficient synthesis of a simplified taxane core substitute, together with a click-chemistry combinatorial search for phenylisoserine side-chain surrogates.
Three new flavonoid glycosides, byzantionoside B 6′-O-sulfate and xyloglucoside of (Z)-hex-3-en-1-ol from Ruellia patula
Samy, Mamdouh Nabil,Khalil, Hany Ezzat,Sugimoto, Sachiko,Matsunami, Katsuyoshi,Otsuka, Hideaki,Kamel, Mohamed Salah
experimental part, p. 725 - 729 (2011/07/30)
Three new flavonoid glycosides, demethoxycentaureidin 7-O- β-D-galacturonopyranoside, pectolinarigenin 7-O- α-L-rhamnopyranosyl- (1?→4″)- β-D-glucopyranoside and 7-O- α-L-rhamnopyranosyl-(1?→4″)- β-D- glucuronopyranoside, a new megastigmane glucoside, byzantionoside B 6′-O-sulfate, and a new (Z)-hex-3-en-1-ol O-β-D-xylopyranosyl- (1″→2′)- β-D-glucopyranoside, were isolated from leaves of Ruellia patula JACQ., together with 12 known compounds, β-sitosterol glucoside, vanilloside, bioside (decaffeoyl verbascoside), acteoside (verbascoside), syringin, benzyl alcohol O- β-D-xylopyranosyl- (1″→2′)- β-D-glucopyranoside, cistanoside E, roseoside, phenethyl alcohol O- β-D-xylopyranosyl-(1″→2′)- β-D-glucopyranoside, (+)-lyoniresinol 3 α-O- β-D- glucopyranoside, isoacteoside and 3,4,5-trimethoxyphenol O- α-L- rhamnopyranosyl-(1″→6′)- β-D-glucopyranoside. Their structures were elucidated by means of spectroscopic analyses.
Degradation kinetics of glucuronic acid in subcritical water
Wang, Rongchun,Neoh, Tze Loon,Kobayashi, Takashi,Miyake, Yasuhito,Hosoda, Asao,Taniguchi, Hisaji,Adachi, Shuji
experimental part, p. 601 - 605 (2011/04/23)
The degradation kinetics of glucuronic acid (GlcA) under subcritical conditions from 160 to 200 °C was studied in a continuous tubular reactor. The formation of glucuronolactone (GlcL) during the treatment of GlcA in subcritical water was substantiated by ESITOF-MS and 1H NMR. The degradation of GlcA consisted of the reversible conversion of GlcA to GlcL and the irreversible degradation of the two compounds. The changes in the concentrations of GlcA and GlcL with residence time could be described by first-order kinetics. Higher temperatures accelerated the degradation of GlcA, and thus resulted in rises in the pH value. The degradation reaction of GlcL under the same conditions was also investigated. The activation energy of the reverse hydrolysis of GlcA to GlcL and that of the hydrolysis of GlcL to GlcA were determined to be 88.5 and 63.2 kJ/mol respectively. The enthalpy change in the reversible conversion between GlcA and GlcL was 25.4 kJ/mol.
Large scale synthesis of the acetonides of l-glucuronolactone and of l-glucose: easy access to l-sugar chirons
Weymouth-Wilson, Alexander C.,Clarkson, Robert A.,Jones, Nigel A.,Best, Daniel,Wilson, Francis X.,Pino-González, Maria-Soledad,Fleet, George W.J.
experimental part, p. 6307 - 6310 (2010/01/18)
1,2-O-Isopropylidene-α-l-glucurono-3,6-lactone may be synthesized on a 100-200 g scale from cheaply available d-glucoheptonolactone in an overall yield of 94% in four steps via l-glucuronolactone. Subsequent elaboration to l-glucose, diacetone-l-glucose (1,2:5,6-di-O-isopropylidene-α-l-glucofuranose), and monoacetone-l-glucose (1,2-O-isopropylidene-α-l-glucofuranose) allows easy access to a range of l-sugar chirons.
Process for selectively oxidizing primary hydroxyl groups of organic compounds, and resin containing adsorbed catalyst for use therein
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Example 10, (2008/06/13)
A method for selectively oxidizing the primary hydroxyl group of an organic compound which comprises reacting a resin having an amine oxide adsorbed thereon and an electrolytically oxidized product of a halogen-containing compound with the organic compound having the primary hydroxyl group.
Radical-based asymmetric synthesis: an iterative approach to 1, 3, 5, ... (2n + 1) polyols.
Garner,Anderson
, p. 1057 - 1059 (2008/02/09)
[formula: see text] A conceptually novel approach to 1, 3, 5, ... (2n + 1) polyols based on iterative stereo-controlled homologation of chiral hydroxyalkyl radicals is reported. Starting from alpha-keto ester precursors, the general sequence of (1) ketone
A γ-PYRONYL-TRITERPENOID SAPONIN FROM PISUM SATIVUM
Tsurumi, Seiji,Takagi, Toshihiro,Hashimoto, Tohru
, p. 2435 - 2438 (2007/10/02)
A new triterpenoid saponin was isolated from Pisum sativum and characterized as 3-O-2)-β-D-galactopyranosyl(12)-β-D-glucuronopyranosyl(1)>-22-O-)>-3β,22β,24-trihydroxyolean-12-ene.The name chromosaponin I is proposed.Chromosaponin I yielded soyasaponin I, known as phytochrome inhibitor, during extraction, but the latter was not found in the free form in this plant. Key Word Index - Pisum sativum; Leguminosae; pea: phytochrome inhibitor; triterpenoid saponin; soyasaponin I derivative; chromosaponin I.
