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Volume 19, Issue 8
Displaying 1-38 of 38 articles from this issue
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Syntheses and Activities of Bioquinone Substances. II. Ubichromenol Phosphates and Related CompoundsYOSHIAKI WATANABE, TADASHI SUZUKI, TERUYA SEKI1971 Volume 19 Issue 8 Pages 1519-1525
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe syntheses of ubichromenol phosphates (III, n=3, 6 and 9) and related compoundsare described. Their chromatographic and spectral data were given. Moreover, III (n=9) was hydrogenated to perhydroubichromenol phosphate (IV) which wasalso prepared through the two different ways starting from ubiquinone-(45) II (n=9).
From the results of a preliminary study of III (n=9) on the mitochondrial respirationof rat liver, it was found that the succinate dehydrogenase activity was not affected, but both the succinate oxidase and the succinate-neotetrazolium chloride oxidoreductaseactivities were inhibited, and a marked difference from the effect of ubiquinone.View full abstractDownload PDF (960K) -
SADAO NISHIGAKI, KEITARO SENGA, FUMIO YONEDA1971 Volume 19 Issue 8 Pages 1526-1530
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe convenient dimethylamination using dimethylformamide (DMF) of chloropyrimidineshas been accomplished. Reaction of a chloropyrimidine and a 5-activatedpyrimidine in DMF resulted in the simultaneous formation of a dimethylaminopyrimidineand a 5-formylpyrimidine which is further transformed in some cases.View full abstractDownload PDF (722K) -
MINORU SEKIYA, KUNIO SUZUKI1971 Volume 19 Issue 8 Pages 1531-1539
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSOn heating 5, 5-dimethyl-1, 3-cyclohexanedione with a reagent, triethyl ammoniumformate, given by 5HCOOH·2N (C2H5) 3, methylation at its 2-position was induced. Thisreaction appears refered to as a methylation of active methylene compound as is previouslyrealized in 5-methylation of barbituric acids. Route of the reaction was revealedand found to involve some characteristic intermediate reduction steps induced by formicacid, that is, hydrogenation of carbon-carbon double bond and reductive fission of carboncarbonsingle bond of intermediate compounds.View full abstractDownload PDF (1529K) -
Formic Acid Reduction. X. Reductive Fission of Bridged Carbon-Carbon Bond of Bisdimedone DerivativesMINORU SEKIYA, KUNIO SUZUKI1971 Volume 19 Issue 8 Pages 1540-1545
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSIt has now been found that triethylammonium formate (TEAF), given by 5HCOOH·2N (C2H5) 3 causes the reductive fission of the bridged carbon bonds of 2, 2'-alkylidene and 2, 2'-arylidene-bisdimedones by heating. The reaction gave a number of productsby the secondary reactions succeeding to the reductive fission. Routes of these reactionsare also described.View full abstractDownload PDF (861K) -
TERUHIKO MESHI, JUKO SUGIHARA, YOSHISHIGE SATO1971 Volume 19 Issue 8 Pages 1546-1556
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSAbsorption, excretion and metabolism of d-cis-3-acetoxy-5-[2-(dimethylamino) ethyl]-2, 3-dihydro-2-(p-methoxyphenyl)-1, 5-benzothiazepin-4 (5H)-one hydrochloride (CRD-401) were studied in rats. CRD-401 was found to be absorbed rapidly and almost completelyfrom the digestive tract, the half-life for absorption being 26 min.
More than 90% of the radioactivity after oral administration of 14C-CRD-401 wasrecovered from the feces and urine within 72 hours. The feces is the major excretoryroute since approximately 60% of the total radioactivity recovered appeared in the 72hour feces and 65% of the administrated radioactivity was excreted in the 24 hour bile.
CRD-401 was extensively metabolized by rat since only 0.1% of the drug wasrecovered unchanged in the 24 hour urine and bile. Metabolic pathways of CRD-401 consisted of deacetylation, N-demethylation, O-demethylation, hydroxylation andN-oxidation. Major metabolites in urine and bile were deacetyl-O-demethyl-CRD-401, deacetyl-N, O-demethyl-CRD-401, and deacetyl-N, O-demetyl-methoxyl-CRD-401. Thepresence of N-oxide analogs of CRD-401 as minor metabolites was demonstrated inurine but not in bile.View full abstractDownload PDF (1734K) -
SEIGORO HAYASHI, MITSURU FURUKAWA, YOKO FUJINO, TORU NAKAO, SEIICHI IN ...1971 Volume 19 Issue 8 Pages 1557-1561
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSIn order to examine the relationship between the carcinostatic activities of Buntesalts and their chemical behaviours, several Bunte salts, in which some of them weredifunctional, were synthesized and attempted to react with several active methylenecompounds, thiols and amines. In the reactions with thiols and amines, all of the Buntesalts resulted in the formation of the corresponding disulfides or the recovery of the startingmaterials. But in the reaction with active methylene compounds, alkylmercapto orbisalkylmercapto derivatives and cyclic mercaptal were formed respectively.View full abstractDownload PDF (703K) -
HARUO SAIKACHI, TOKUJIRO KITAGAWA1971 Volume 19 Issue 8 Pages 1562-1566
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSMethyl (ethyl) 5-(2'-furyl) isoxazole-3-carboxylate (3a and 3b) were prepared frommethyl (ethyl) 2-furoylpropiolates with hydroxylamine, respectively. Methyl (ethyl) 5-(2'-furyl) pyrzaole-3-carboxylates (10a and 10b) were formed by the condensation ofmethyl (ethyl) 2-furoylpropiolates with hydrazine hydrate. The corresponding 5'-nitrofuran derivatives (4a and 11b) were obtained in usual manner, and the each position ofnitro group of the furan rings was confirmed by the nuclear magnetic resoance and infraredspectral data.View full abstractDownload PDF (864K) -
WATARU NAGATA, MASAYUKI NARISADA, TOSHIO WAKABAYASHI, YOSHIO HAYASE, M ...1971 Volume 19 Issue 8 Pages 1567-1581
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSB-Nor-Δ4-3-ketosteroids such as compounds (11a, 11b, 11c, 17a, 17b and 23) weresynthesized starting from Δ5-3β-hydroxysteroids.
Hydrocyanation of these enones was investigated and by treatment with diethylaluminumcyanide only the 5β-vinyl derivatives (17a, 17b and 23) gave successfullythe corresponding 3-keto-5β-cyano compounds (18a, 18b, and 24a), intermediatesnecessary for the synthesis of B-norsteroids having cis-bicyclo [3, 2, 1] octane ring system.View full abstractDownload PDF (2842K) -
WATARU NAGATA, TOSHIO WAKABAYASHI, MASAYUKI NARISADA, MASAAKI YAMAGUCH ...1971 Volume 19 Issue 8 Pages 1582-1593
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSSynthesis of 3a-methylene-3β, 5β-ethano-B-nor-5β-androstane 6β-carboxylic acid (1) having a gibbane B-C-D ring system is described. 5β-Cyano-6β-vinyl-B-nor-5β-androstan-3-one (5), the starting material, was transfomed stereoselectively to 3α-tosyloxy-5β-(trans-β-formyl) vinyl-6β-vinyl-5β-androstane (22d), the key intermediate, by theeight-step synthesis. The latter, after selective ozonization was subjected to a newcyclization method involving Participation of 6β-hemiacetal function to afford 3β, 5β-etheno derivative (38), which on subsequent oxidation and the Wolff-Kishner reduction, led to the desired compound (1). Some attempted experiments for homologation atthe 5β-nitrile function are also described.View full abstractDownload PDF (1760K) -
SEIGORO HAYASHI, MITSURU FURUKAWA, YOKO FUJINO, TORU NAKAO, KENJI NAGA ...1971 Volume 19 Issue 8 Pages 1594-1597
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSSeveral mono and bistrithiocarbonates were synthesized by the reaction of the correspondingmono and bisepoxides with carbon disulfide in the presence of potassiumhydroxide. These trithiocarbonates were successfully obtained even in the presenceof a catalytic amount of potassium hydroxide. Potassium methoxide instead of potassiumhydroxide as catalyst also gave trithiocarbonate in good yield.View full abstractDownload PDF (515K) -
HIKOKICHI OURA, SUSUMU HIAI, HACHIRO SENO1971 Volume 19 Issue 8 Pages 1598-1605
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe in vivo administration of a fraction obtained by partial purification of radix ginseng extract stimulated the incorporation rate of labeled precursors into nuclear RNA, and a maximum increase was shown at 4 hr after a single dose intraperitoneal injection and the rate returned almost to the control level 24 hr after treatment in a rat. However, the RNA content of nuclei isolated from each interval after treatment is the same in the RNA to DNA ratio as in the control animals. The sedimentation profile by sucrose density gradient of rapidly labled nuclear RNA isolated from the liver of a rat treated with fraction 4 showed a stimulation in the 23s to 7s region which has a peak at 1Os region. Rate of the incorporation of labeled precursors into the interphase RNA rather than the nuclear sap RNA was stimulated significantly by fraction 3 and the base composition of this 32P pulse-labeled RNA showed an intermediate value between the ribosamal and DNA-like RNA. The effect of ginseng extract (fraction 3) on the nuclear DNA synthesis was not observed in the present assay by the incorporation of 3H-thymidine in rat liver.View full abstractDownload PDF (1479K) -
SHOJI TAKEMURA, HATSUMI NIIZATO, YOSHIO UENO1971 Volume 19 Issue 8 Pages 1606-1610
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe reaction of N, N-dibromobenzenesulfonamide (I) with cyclohexene (II) in formamide or dimethylformamide were studied. The reaction of I with II in formamide gave a major product, trans-2-bromo-1-cyclohexyl N-benzenesulfonylformimidate (III), and minor products, trans-1, 2-dibromocyclohexane (IV), trans-2-bromocyclohexyl formate (V), trans-2-bromocyclohexanol (VI) and benzenesulfonamide (VII).
The reaction in dimethylformamide, contrary to that in formamide, gave another type of product, N, N-dimethyl-N'-benzenesulfonylformamidine (IX), IV, V and VI were also obtained as by-products.
The mechanism to form these products was discussed.View full abstractDownload PDF (689K) -
Tozo FUJII, TAISUKE ITAYA1971 Volume 19 Issue 8 Pages 1611-1617
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSTreatment of 1-alkoxyadenine (I) with reactive alkyl halides (R2X) in N, N-dimethylacetamide yielded the 9-alkylated salts (II) in good yields. However, an alkyl halide (R2X) less reactive than that (R1X) whose alkyl group was the same as in I reacted with I to give a mixture of at most four possible 1-alkoxy-9-alkyladenine salts (II, IV, V, and VII), two 9-alkyladenine 1-oxides (III and VI), and, possibly, a more reactive alkyl halide (R1X). The intricate pattern of formation of products was due to O→N (9) alkyl migration during the reaction, and a plausible mechanism is presented. A clear O→N (9) benzyl migration was demonstrated by the reaction of 1-benzyloxyadenine (I: R1=C6H5CH2) with 0.1 equivalent of benzyl bromide to give 0.58 equivalent of 9-benzyladenine 1-oxide (VI: R1=C6H5CH2).View full abstractDownload PDF (1267K) -
YOSHIHIKO FUNAE, NOBUO TOSHIOKA, ITARU MITA, TERUO SUGIHARA, TETSUYA O ...1971 Volume 19 Issue 8 Pages 1618-1626
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSStability constants of complexes formed by zinc, cadmium, lead (II) and iron (II) with 2-mercaptopropionylglycine (MPGH2) have been calculated from pH titration data at 25°and μ=0.15 (NaClO4). In case of mercury (II), titrations were performed with m efcury (II)-iodide-MPGH2 mixtures at μ=0.5 (KNO3). Mercury (II) complexes of MPGH2 and other related compounds have been isolated and their structures were studied with infrared spectra.View full abstractDownload PDF (1406K) -
HYOZO TANIYAMA, YOSUKE SAWADA, TSUNEHIRO KITAGAWA1971 Volume 19 Issue 8 Pages 1627-1634
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe characterization was conducted on racemomycin (abbreviated as RM) A, B, C, and minor D components isolated in pure form by column chromatographies. RM-A was identified with streptothricin. Amino acid analysis of the acid hydrolysates revealed the presence of 1, 2, 3 and 4 β-1ysine residues in RM-A, C, B, and D components respectively, And also it was apparent that the biological activities such as antimicrobial, antiviral and acute toxicity were stronger in order of the number of β-1ysine residues in a molecule.View full abstractDownload PDF (1279K) -
YOSHIFUMI MAKI, MASAHIRO TAKAYA1971 Volume 19 Issue 8 Pages 1635-1640
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSIn order to explore the scope of the ring contraction of pyridazinone to pyrazole, 2-phenyl-3 (2H)-pyridazinones (IIIa-f) and (IVa-e) having 4 and 5 substituents other than chlorine were prepared and examined their behavior against sodium hydroxide. Amongthem, (Ma, b) and (IVa, b, e) undergothe ring contraction to afford the corresponding pyrazole carboxylic acid, (V), (VII), and (VIII). From available data, substituent effects and mechanisms for these ring contractions were discussed.
In the course of this study, an unusual displacement reaction was observed in the reaction of 2-phenyl-4-chloro-5-methylthio-3 (2H)-pyridazinone (IIIa) with sodium hydroxide and sodium ethoxide.View full abstractDownload PDF (890K) -
MITSUAKI MAEDA, MINEO SANEYOSHI, YUTAKA KAWAZOE1971 Volume 19 Issue 8 Pages 1641-1649
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe reaction mechanism for the hydrogen exchange of C-8 hydrogens of purine ribosides was discussed on the basis of the pD-rate profiles and the effect of 6-substituents on the rate. It was shown that the rate depended on concentrations of the purine and D2O and that the observed second-order rate constant was expressed as kOD-KD2O/Ka (N7) where kOD-was the rate constant for hydrogen exchange of N7-protonated purines by attack with the OD-, KD2O was the dissociation constant of D2O, and Ka (N7) was the dissociation constant of N7-protonated purines.View full abstractDownload PDF (1187K) -
MICHIYUKI OGAWA, TAKEICHI SAKAGUCHI1971 Volume 19 Issue 8 Pages 1650-1655
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSWe could isolate metal complexes of inosinic acid (IMP) with Pb, Cd, Co (II), Zn, Cu (II), Ni and Mn as crystalline precipitates and Hg (II) was amorphous one from the solution of pH 3.0-7.0
The elementary analysis revealed that the isolated metal complexes had the composition of 1:1 of IMP to metal, except Hg-IMP whose composition is 2:3. And we discussed the infrared (IR) absorption spectra of these metal complexes and compared with thos eof IMP Na, IMP 2Na, IMP 2K, IMP Ca and IMP Ba salt. Metal complexes with Co (II), Ni, Mn, Cd, and Pb as well as the above salt compounds showed the C=O stretching absorption in the region of about 1690cm-1.
Complexation with Cu (II), Zn and Hg (II) shifted this frequency to 1710, 1708, and 1640cm-1 respectively.
In the region of 1200-900cm-1 absorptions due to the phosphate group are expected, the metal complexes except Cu-IMP and Zn-IMP showed the similar spectra to those of IMP salt compounds, such as IMP 2Na and IMP 2K. Cu-IMP and Zn-IMP showed a little complicated spectra also in this region.
From the above results we concluded that Cu (II), Zn and Hg (II) coordinated not only to the phosphate group but also to the hypoxanthine moiety of IMP The coordination sites of Cu (II) and Zn on the hypoxanthine moiety were considered N-7 and that of Hg (II) was C-O from the spectral changes and elementary analysis.
Additional experiments of NMR spectra in D20 revealed the protonation to N-7 of hypoxanthine moiety from the phsophate group of IMP free acid.View full abstractDownload PDF (918K) -
SUSUMU HIAI, HIKOKICHI OURA, KINJI TSUKADA, YOSHIKATSU HIRAI1971 Volume 19 Issue 8 Pages 1656-1663
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSIt was shown that a single intraperitoneal injection of extract (fraction 3 and 4) from roots of Panax ginseng C. A. MEYER, increased activity of RNA polymerase (EC 2.7.7.6), assayed in vitro, of deoxycholate-lysed nuclei of rat liver. The maximum increase of the enzyme activity was found at 2 hr with a lag period of 30 min after treatment. The increase was still observed 8 hr after the injection of the extract but disappeared after 16 hr. The increase in the activity was found in the presence of high concentration of ammonium sulfate in vitro as well as in the absence of the salt.
Three hours after treatment in vivo, a little increase of protein synthesis was also observed in liver homogenate or nuclei and abolished by prior administration of puromycin. The increase in the activity of the polymerase due to ginseng extract did not disappear even when the synthesis of bulk nuclear protein was greatly inhibited by puromycin.View full abstractDownload PDF (1398K) -
HIDETAKA YUKI, YOKO KAIZU, SEISUKE YOSHIDA, SADAO HIGUCHI, SUSUMU HOND ...1971 Volume 19 Issue 8 Pages 1664-1668
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSDerivatives of tenuazonic acid, 3-acetyl-5-sec-butyltetramic acid, were synthesized. 5-Substituted 3-acetyl tetramic acids were condensed with primary aromatic amines refluxing in alcohol. The structure of the condensation products were determined as 5-substituted 3-(1'-anilinoethylidene) pyrrolidine-2, 4-dione. The stability of the one of the condensation products was investigated, and it was found to be stable in acidic and neutral, but unstable in alkaline medium.View full abstractDownload PDF (812K) -
MASATOMO HAMANA, ITSUMARO KUMADAKI1971 Volume 19 Issue 8 Pages 1669-1680
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESS1-Methyl-2-ethoky-, 2-ethoxy- and 3-methoxy-indoles (I, II, and III) were applied to some N-oxides of pyridine series in the presence of an acylating agent. The reaction. of I with quinoline 1-oxide (IV) in the presence of tosyl chloride or benzoyl chloride progressed in the cold, and 1-methyl-2-ethoxy-3-(2-quinolyl) indole (V) was obtained in good yields. The reaction under heating was prone to afford the oxindole derivative (VI), the total yield being decreased. Not only 2-chloro- and 4-chloroquinoline 1-oxides (X and XIII) but also pyridine and 4-chloropyridine 1-oxides (XXII and XXVII) were shown to react similarly with I in the presence of tosyl chloride to give the corresponding 3-substituted indoles, XI, XIV, XXIII, and XXVIII, respectively.
Similar reaction of II with IV yielded 2-ethoxy-3-(2-quinolyl) indole (XXX).
The reaction of III with IV or ethyl nicotinate 1-oxide (XLIII) led to the formation of 2-substituted-3-methoxy-indoles (XXXIII and XLIV), although the yield of XLIV was very poor.
The mechanism of the reductive de-ethoxylation of 2-ethoxy-3-(2-quinolyl or 2-pyridyl) indoles (V, XIV, XXX, and XXIII) by lithium aluminium hydride was discussed.View full abstractDownload PDF (1962K) -
HISASHI MIYAZAKI, AKIRA KAGEMOTO, MIYOKO ISHI-I, YASUO MINAKI, KIYOSHI ...1971 Volume 19 Issue 8 Pages 1681-1690
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe distribution of radioactivity after intravenous administration of MF-PCPA*, MF-DMAE*, PCPA*, and DMAE* was investigated by autoradiography and radioactivity measurement. The uptake of the label by brain was emphasized. Radioactivity was high in brain immediately after the injection of either MF-PCPA* or MF-DMAE*, but was negligible after the administration of the constituents. Radioactivity in brain remained relatively high even at 24 hr after administration of MF-DMAE* while it was gradually disappeared after the injection of MF-PCPA*. The distribution pattern of the label in whole body was very similar each other when animals were given MF-PCPA* and PCPA*, or when given MF-DMAE* and DMAE* except for the rapid condensation of the labelled MF into the brain.View full abstractDownload PDF (6986K) -
HISANOBU YOSHIDA, KOJIRO MATSUMOTO, TERUMI NAKAJIMA, ZENZO TAMURA1971 Volume 19 Issue 8 Pages 1691-1695
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe method for condensation of plasma kinins with high selectivity in biological samples was presented using siliconised silica gel. The method may be applied for kinins in urine, plasma, amuniotic fluid and lymph. The condensed kinin fraction was free from inorganic salts, urea, active amines and major proteins in plasma, and was charged directly on column chromatographic separation in the next step. Some of the kinins in biological fluid was purified as a single fluorescen band by dansylation on thin-layer chromatography within the two steps. The recovery of bradykinin (1 to 100μg) was 70 to 90% during the procedure.View full abstractDownload PDF (828K) -
MASUO MURAKAMI, NORIYOSHI INUKAI, AKIO KODA, KOHZI NAKANO1971 Volume 19 Issue 8 Pages 1696-1699
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThis report relates to a new industrial synthesis of metoclopramide (I). Methyl 4-amino-2-methoxybenzoate (V) was prepared by methylation of p-aminosalicylic acid (III) using dimethyl sulfate in the presence of potassium hydroxide in acetone. V and it's saponified product (VI) were chlorinated with iodobenzene dichloride to obtain methyl 4-amino-5-chloro-2-methoxybenzoate (VII) and 4-amino-5-chloro-2-methoxybenzoic acid (VIII) respectively. VIII was also prepared by saponification of VII. VIII was condensed direct with N, N-diethylethylenediamine (IV), of which amino group was activated by phosphorus trichloride, whereby I was obtained in high yields.View full abstractDownload PDF (792K) -
ITIRO YOSIOKA, TAMIO SUGAWARA, AKIO OHSUKA, ISAO KITAGAWA1971 Volume 19 Issue 8 Pages 1700-1707
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe structures of two glycosides, named ziyu-glycoside I and ziyu-glycoside II, obtained from Sanguisorbae Radix have been established as I and II respectively by virtue of the soil bacterial hydrolysis method. Furthermore, it has been revaled that the genuine aglycone of the glycosides is pomolic acid (XI) and is not tomentosolic acid (III).View full abstractDownload PDF (1521K) -
MASAYOSHI MURAKI, TOMISHIGE MIZOGUCHI1971 Volume 19 Issue 8 Pages 1708-1713
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSN, S-Bis-tert-butoxycarbonyl-L-cysteine (I), a novel protected cysteine derivative, is proposed for glutathione synthesis. I was obtained in one step reaction from L-cysteine and tert-butoxycarbonyl chloride. The reaction of tert-butoxycarbonyl azide with L-cysteine also gave I but in low yield. The protecting groups on the nitrogen and sulfur atoms of I are stable under the usual conditions used in peptide synthesis and can be removed selectively by mild acidic or alkaline conditions. These groups are also removed simultaniously by a strong acidic reagent such as hydrogen chloride of high concentration in acetic acid. Synthesis of glutathione was performed employing I as a new type of intermediate.View full abstractDownload PDF (1055K) -
HIDEAKI UMEYAMA, TSUNEJI NAGAI, HISASHI NOGAMI1971 Volume 19 Issue 8 Pages 1714-1721
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSThe adsorption of phenols by carbon black from aqueous solution was investigated. to discuss the mechanism of interaction on the adsorbent surface, referring to the partition coefficient in n-octanol/water system, Px.
The shape of adsorption isotherm was discussed with respect to the position of substituents and also the degree of dissociation.
There was found a linear relationship between Langmuir constant a and log Px. This result was explained thermodynamically on the assumption of a surface layer on the carbon black, concluding that the surface layer is considered to play the similar role to n-octanol layer in the partition experiment.
Free energy of adsorption calculated from Langmuir constant b seemed to be an apparent one and to be influenced predominantly by the free energy of binding.
Regarding the relationship between the adsorbed amount at an identical equilibrium concentration, Mc, and the equilibrium concentration at an identical adsorbed amount, Cm, the following equation was derived:
log Mc=(1/λ)log (1/Cm)+κ
where λ and κ are constant.
Plotting log Mc against log Px the derivatives were classified into groups I and II, suggesting the increase in adsorption of group I may be predominantly due to the tendency of the hydrophobic bonding, while that of group II may be influenced by the free energy of binding in addition to the tendency of the hydrophobic bonding.View full abstractDownload PDF (1279K) -
KOGORO MORI, HARUHIKO SUGIYAMA, MINORU SEKIYA1971 Volume 19 Issue 8 Pages 1722-1727
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
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TOSHIO NAMBARA, SETSUKO AKIYAMA, SEIJIRO HONMA1971 Volume 19 Issue 8 Pages 1727-1730
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
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TOZO FUJII, TADAO SATO, TAISUKE ITAYA1971 Volume 19 Issue 8 Pages 1731-1734
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSDownload PDF (797K) -
YASUMITSU TAMURA, YASUYUKI KITA1971 Volume 19 Issue 8 Pages 1735-1736
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
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FUMIHIKO KANZAWA, AKIO HOSHI, KAZUO KURETANI1971 Volume 19 Issue 8 Pages 1737-1738
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSAntitumor activity of 8-azaguanine was enhanced by simultaneous administration of 5-amino-4-imidazolecarboxamide (AICA). This effect was suggested to be due to the inhibition of guanine deaminase (3.5.4.3) by AICA. 1-β-D-Ribofuranosyl-and 5-formamide derivatives of AICA were not inhibitory. In continuation of a previous report, inhibitory compounds for guanine deaminase more potent than AICA were searched among derivatives of imidazole. 4-Imidazolecarboxamide was thus found as a potent inhibitor.View full abstractDownload PDF (245K) -
MIKIO YAMAZAKI, SHIGETOSHI SUZUKI, KOMEI MIYAKI1971 Volume 19 Issue 8 Pages 1739-1740
Published: August 25, 1971
Released on J-STAGE: January 31, 2011
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JUNZO SHOJI, SACHIKO KAWANISHI, YASUMASA TSUKITANI1971 Volume 19 Issue 8 Pages 1740-1742
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
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HIDEO INOUE, TOHRU UEDA1971 Volume 19 Issue 8 Pages 1743-1744
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
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TOSHIHIKO OKAMOTO, MASAHIKO NAGAKURA1971 Volume 19 Issue 8 Pages 1745-1746
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
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TATSUSHI MURAE, TAKAHIKO TSUYUKI, TAKEYOSHI TAKAHASHI1971 Volume 19 Issue 8 Pages 1747-1749
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
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TETSUYA KAMATAKI, MITSUKAZU KITADA, HARUO KITAGAWA1971 Volume 19 Issue 8 Pages 1749-1750
Published: August 25, 1971
Released on J-STAGE: February 08, 2011
JOURNAL FREE ACCESSDownload PDF (317K)
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