Preparation on oligostilbenes of isorhapontigenin by oxidative coupling reaction.

abstract：:A reaction of methyl (4R,5R)-4,5-epoxy-2(E)-hexenoate 1 with N-benzylmethylamine gave a diastereomerically pure methyl (4R,5R)-4,5-epoxy-(3S)-N-benzylmethylamino hexanoate 6 and methyl (4S,5R)-4-N-benzyl-methylamino-5-hydroxy-2(E)-hexenoate 7. The former was chemoenzymatically converted to (-)-osmundalactone 11, which...

journal_title：Chemical & pharmaceutical bulletin

authors： Saotome C,Ono M,Akita H

更新日期：2001-07-01 00:00:00

abstract：:Five new compounds, hibicuslide A (1), hibicuslide B (2), hibicuslide C (3), hibicutaiwanin (4), hibicusin (5), and fifty-one known compounds have been isolated from the stems of Hibiscus taiwanensis. The structures of these compounds were determined by spectroscopic and chemical transformation methods. Among them, ma...

journal_title：Chemical & pharmaceutical bulletin

authors： Wu PL,Wu TS,He CX,Su CH,Lee KH

更新日期：2005-01-01 00:00:00

abstract：:A novel series of quinoline azodyes (5-(4'-derivatives phenyldiazo)-8-hydroxy-7-quinolinecarboxaldehyde)) (HL1-HL5) has been prepared and characterized by elemental analyses, 1H-NMR and IR spectra. The IR spectral data indicate that the compounds can exist in two resonance structures. Proton-ligand dissociation consta...

journal_title：Chemical & pharmaceutical bulletin

authors： El-Sonbati AZ,El-Bindary AA,Shoair AGF,Younes RM

更新日期：2001-10-01 00:00:00

abstract：:Hyaluronate-hydroxyethyl acrylate blend gel (HA-PHEA) were prepared to modify the brittleness of hyaluronate gel (HA) and the characteristics of HA-PHEA gel were compared with those of HA and polyhydroxyethyl acrylate (PHEA) gels. These gels were high in water content and transparent. HA-PHEA gel was improved in visco...

journal_title：Chemical & pharmaceutical bulletin

authors： Jin Y,Yamanaka J,Sato S,Miyata I,Yomota C,Yonese M

更新日期：2002-10-01 00:00:00

abstract：:Tryptanthrin is an ancient medicine which recently was also found to have a function of downregulating multidrug resistance (MDR). However, tryptanthrin is insoluble in water, which limits its availability for delivery into cancer cells. There is a need to improve delivery systems to increase the inhibition of MDR. Th...

journal_title：Chemical & pharmaceutical bulletin

authors： Fang YP,Lin YK,Su YH,Fang JY

更新日期：2011-01-01 00:00:00

abstract：:Two sensitive and selective spectrofluorimetric and spectrophotometric stability-indicating methods have been developed for the determination of some non-steroidal anti-inflammatory oxicam derivatives namely lornoxicam (Lx), tenoxicam (Tx) and meloxicam (Mx) after their complete alkaline hydrolysis. The methods are ba...

journal_title：Chemical & pharmaceutical bulletin

authors： Taha EA,Salama NN,Fattah Lel-S

更新日期：2006-05-01 00:00:00

abstract：:Colon-specific drug delivery systems (CDDS) can improve the bioavailability of drug through the oral route. A novel formulation for oral administration using pH-enzyme Di-dependent chitosan mcirospheres (MS) and 5-Fu as a model drug has been investigated for colon-specific drug delivery by the emulsification/chemical ...

journal_title：Chemical & pharmaceutical bulletin

authors： Zhao XL,Li KX,Zhao XF,Pang DH,Chen DW

更新日期：2008-07-01 00:00:00

abstract：:6-Amino-6-deoxyfumagillol (5) was synthesized by reductive amination of 6-oxo-6-deoxyfumagillol (4), which was obtained by oxidation of fumagillol (2). The reduction proceeded stereoselectively by the equatorial attack of hydride and 5 was found to have the same stereochemistry as that of 2. Several derivatives of 5 w...

journal_title：Chemical & pharmaceutical bulletin

authors： Marui S,Kishimoto S

更新日期：1992-03-01 00:00:00

abstract：:The interaction of halofantrine with phosphatidylcholine and phosphatidylethanolamine bilayers has been investigated by differential scanning calorimetry. Halofantrine caused a broadening of the gel to liquid crystalline phase transition endotherm of the phosphatidylcholines. A decrease in the transition temperature T...

journal_title：Chemical & pharmaceutical bulletin

authors： Lim LY,Go ML

更新日期：1999-06-01 00:00:00

abstract：:Freshwater cyanobacteria produce lethal toxins such as microcystins and anatoxins. During the purification of microcystins in bloom samples we found that a toxic cyanobacterium produced not only microcystins but also other types-peptides in early 1990. Since then we have isolated approximately thirty peptides from fre...

journal_title：Chemical & pharmaceutical bulletin

authors： Harada K

更新日期：2004-08-01 00:00:00

abstract：:Novel saponins that retain a free carboxyl group at the C-17 position and various sugars linked at the C-3 position of hederagenin aglycone were synthesized via stereospecific glycosylation. Since these natural products represented by Pulsatilla saponin D (PSD) were obtained in very small amounts, the total synthesis ...

journal_title：Chemical & pharmaceutical bulletin

authors： Kim M,Park Y,Chung WY,Park KK,Jung M

更新日期：2015-01-01 00:00:00

abstract：:Synthesis of (1R,2S,5S,6R,8S)-3-azabicyclo[3.3.0]octane-2,6,8-tricarboxylic acid (2) from trans-4-hydroxy-L-proline (5) was attempted. A Diels-Alder reaction of 3,4-dehydroproline derivative 9 and cyclopentadiene afforded a single stereoisomer 11. The Diels-Alder adduct was smoothly converted to the hydrochloride of 2...

journal_title：Chemical & pharmaceutical bulletin

authors： Arakawa Y,Ohnishi M,Yoshimura N,Yoshifuji S

更新日期：2003-08-01 00:00:00

abstract：:A series of novel N6,N6-dialkyl adenosine 3',5'-cyclic phosphates N6,N6-dialkyl cAMPs) was synthesized from 2'-O-p-toluenesulfonyl cAMP (2'-O-tosyl cAMP, 2) and tested for inotropic and chronotropic activities in vitro. Treatment of 2 with excess alkyl halides and sodium hydride followed by detosylation with aqueous N...

journal_title：Chemical & pharmaceutical bulletin

authors： Kataoka S,Yamaji N,Kato M,Kawada T,Imai S

更新日期：1990-11-01 00:00:00

abstract：:The purpose of this study was to predict the stability of octreotide in a mixed infusion containing sodium bisulfite (SBS). In aqueous solution the hydrolysis of octreotide was found to be accelerated by pH, and by increasing concentrations of SBS. Equations for the degradation rate constants (kobs) of pH and SBS were...

journal_title：Chemical & pharmaceutical bulletin

authors： Takasu Y,Yoshida M,Shimizu K,Asahara K,Tange M,Uchida T

更新日期：2014-01-01 00:00:00

abstract：:Fluorescence assays are useful tools for estimating enzymatic activity. Their simplicity and manageability make them suitable for screening enzyme inhibitors in drug discovery studies. However, researchers need to pay attention to compounds that show auto-fluorescence and quench fluorescence, because such compounds lo...

journal_title：Chemical & pharmaceutical bulletin

authors： Itoh Y,Suzuki M,Matsui T,Ota Y,Hui Z,Tsubaki K,Suzuki T

更新日期：2016-01-01 00:00:00

abstract：:A new phenolic glycoside, 3,4,5-trimethoxyphenol-1-(6-xylopyranosyl)glucopyranoside, was isolated together with twenty known compounds identified as koaburaside, 3,4,5-trimethoxyphenol, 5,7-dihydroxychromone-7-neohesperidoside, naringin, neoeriocitrin, p-coumaric acid, vanillin, vanillic acid, coniferyl aldehyde, feru...

journal_title：Chemical & pharmaceutical bulletin

authors： Kosuge K,Mitsunaga K,Koike K,Ohmoto T

更新日期：1994-08-01 00:00:00

abstract：:The mechanism of the electrochemical oxidation of 2,5-dihydroxybenzoic acid and 3,4-dihydroxybenzaldehyde in the presence of 3-hydroxy-1H-phenalene-1-one as a nucleophile has been studied in water/acetonitrile (80/20 v/v) solution using cyclic voltammetry and controlled-potential coulometry methods. The results indica...

journal_title：Chemical & pharmaceutical bulletin

authors： Nematollahi D,Amani A

更新日期：2008-04-01 00:00:00

abstract：:We describe herein a manganese(IV) oxide-mediated oxidation of N-p-methoxyphenyl (PMP)-protected glycine derivatives for the synthesis of α-imino carboxylic acid derivatives. Using this methodology, utilization of unstable glyoxic acid derivatives was avoided. Furthermore, using this methodology we synthesized novel α...

journal_title：Chemical & pharmaceutical bulletin

authors： Inokuma T,Jichu T,Nishida K,Shigenaga A,Otaka A

更新日期：2017-01-01 00:00:00

abstract：:In the course of our chemotaxonomic study of the liverworts growing in Madagascar, mastigophoric acid methyl ester, along with eleven known compounds were isolated from Mastigophora diclados. Isolated metabolites showed that the Malagasy Mastigophora is more related to the samples from Borneo and Japan than to the Tai...

journal_title：Chemical & pharmaceutical bulletin

authors： Harinantenaina L,Asakawa Y

更新日期：2004-11-01 00:00:00

abstract：:N-9-Fluorenylmethoxycarbonyl-Se-4-methoxybenzylselenocysteine++ + [Fmoc-Sec(MBzl)-OH] was synthesized from selenocystine and successfully applied to Fmoc-based solid-phase peptide synthesis. The stability and the deprotection conditions of the Se-MBzl group were examined. The diselenide bond of a peptide was directly ...

journal_title：Chemical & pharmaceutical bulletin

authors： Koide T,Itoh H,Otaka A,Yasui H,Kuroda M,Esaki N,Soda K,Fujii N

更新日期：1993-03-01 00:00:00

abstract：:Invasive fungal disease constitutes a growing health problem and development of novel antifungal drugs with high potency and selectivity against new fungal molecular targets are urgently needed. In order to develop potent antifungal agents, a novel series of 6-alkyl-indolo[3,2-c]-2H-thiochroman derivatives were synthe...

journal_title：Chemical & pharmaceutical bulletin

authors： Han XY,Zhong YF,Li SB,Liang GC,Zhou G,Wang XK,Chen BH,Song YL

更新日期：2016-09-01 00:00:00

abstract：:We have improved sample pre-treatment for the effective removal of polyphenols and simple analysis of caffeine in tea using a cartridge filled with polyvinylpolypyrroridone (PVPP). Nearly 100% of catechins were removed from the green tea sample and caffeine was completely recovered in the range of 98.2-101.3% by sampl...

journal_title：Chemical & pharmaceutical bulletin

authors： Yamauchi Y,Nakamura A,Kitai M,Hatanaka K,Kohno I,Tanimoto T

更新日期：2007-09-01 00:00:00

abstract：:Repeated silica gel and octadecyl silica gel (ODS) column chromatography of the aerial parts of Artemisia princeps PAMPANINI (Sajabalssuk) led to the isolation of a new sesquiterpenoid, 3-((S)-2-methylbutyryloxy)-costu-1(10),4(5)-dien-12,6 alpha-olide (2), along with two previously reported sesquiterpenoids: 8 alpha-a...

journal_title：Chemical & pharmaceutical bulletin

authors： Bang MH,Han MW,Song MC,Cho JG,Chung HG,Jeong TS,Lee KT,Choi MS,Kim SY,Baek NI

更新日期：2008-08-01 00:00:00

abstract：:Possible utility of hydroxyalkylated beta-cyclodextrin (beta-CyD) derivatives as parenteral drug carriers was investigated, using nimodipine, a dihydropyridine derivative with calcium antagonistic action, as a model drug. The aqueous solubility of nimodipine increased linearly with increase in the concentration of hyd...

journal_title：Chemical & pharmaceutical bulletin

authors： Yoshida A,Yamamoto M,Itoh T,Irie T,Hirayama F,Uekama K

更新日期：1990-01-01 00:00:00

abstract：:The tumor microenvironment is considered as one of the important targets for anticancer drug discovery. In particular, nutrient deficiency may be observed in tumor microenvironment; biakamides A-D (1-4) isolated from marine sponge Petrosaspongia sp. as growth inhibitors against cancer cells adapted to glucose-deprived...

journal_title：Chemical & pharmaceutical bulletin

authors： Ishida R,Matsumoto H,Ichii S,Kobayashi M,Arai M,Kotoku N

更新日期：2019-03-01 00:00:00

abstract：:A high-performance liquid chromatographic method and a UV derivative spectrophotometric method for the determination of famciclovir, a highly active antiviral agent, in tablets were developed in the present work. The various parameters, such as linearity, precision, accuracy, specificity, robustness, limit of detectio...

journal_title：Chemical & pharmaceutical bulletin

authors： Srinubabu G,Sudharani B,Sridhar L,Rao JS

更新日期：2006-06-01 00:00:00

abstract：:Three different sensitive and accurate spectroscopic procedures were developed for the determination of three angiotensin-converting enzyme inhibitors, namely, ramipril, enalapril maleate and fosinopril. The first two spectrophotometric (extractive and non-extractive) procedures were based on ternary complex formation...

journal_title：Chemical & pharmaceutical bulletin

authors： Baraka MM,El-Sadek M,Moussa EM,Abd-Alaty NM

更新日期：2008-11-01 00:00:00

abstract：:Manufacturing the solid dosage form of an orally administered drug requires lubrication to enhance manufacturability, ensuring that critical quality attributes such as disintegration and dissolution of the drug product are maintained during manufacture. Here, to evaluate lubrication performance during manufacture, we ...

journal_title：Chemical & pharmaceutical bulletin

authors： Dohi M,Momose W,Yamashita K,Hakomori T,Sato S,Noguchi S,Terada K

更新日期：2017-02-01 00:00:00

abstract：:Synthesis of homoisocarbacyclin has been achieved efficiently by a general strategy with stereo- and regiochemical control. One of homoisocarbacyclin derivatives, 3-oxa homoisocarbacyclin analog (4), was shown to be potently active in inhibiting gastric ulcer. Another analog, conjugated diene derivative (5), was found...

journal_title：Chemical & pharmaceutical bulletin

authors： Shibasaki M,Takahashi A,Aoki T,Sato H,Narita S

更新日期：1989-06-01 00:00:00

abstract：:In the pharmaceutical preparation of a controlled release drug, it is very important and necessary to understand the entire release properties. As the first step, the dissolution test under various conditions is selected for the in vitro test, and usually the results are analyzed following Drug Approval and Licensing ...

journal_title：Chemical & pharmaceutical bulletin

authors： Fukui A,Fujii R,Yonezawa Y,Sunada H

更新日期：2006-08-01 00:00:00