• Title/Summary/Keyword: $\beta$-Lactone

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Bromolactonization of 2-Substituted-1-Cyclohexenyl-1-acetic acid (2-치환-1-Cyclohexenyl-1-acetic acid의 브롬락톤화 반응)

  • Jew, Sang-Sup
    • YAKHAK HOEJI
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    • v.33 no.3
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    • pp.206-210
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    • 1989
  • Bromolactonization of 2-Substituted-1-cyclohexenyl-1-acetic acid (1) with 1,3-dibromo-5,5-dimethylhydantoin (dibromantin) in N,N-dimethylformamide gave the corresponding ${\gamma}-bromo-{\beta}-lactone$ (2) and ${\beta}-bromo-{\gamma}-lactone$ (3). The effect of the substituents, the reaction temperature, and the solvent on the regioselectivity was discussed.

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Isolation and Structural Elucidation of Related Impurities in Canrenone

  • Yang, Ya-Xi;Chen, Guo-Rong
    • Bulletin of the Korean Chemical Society
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    • v.30 no.10
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    • pp.2398-2402
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    • 2009
  • Ten steroidal compounds as impurities in canrenone were isolated from the enriched mother liquor by using various chromatographic methods. Their structures were elucidated by spectrometric analysis, among which three new compounds were characterized as 3-(3-oxo-7$\alpha$-(ethoxycarbonyl)methyl-17$\beta$-hydroxy-4-androsten-17$\alpha$-yl) propionic acid $\gamma$-lactone (1), 3-(3-oxo-7$\alpha$-ethoxy-17$\beta$-hydroxy-4-androsten-17$\alpha$-yl) propionic acid $\gamma$-lactone (2) and 3-(3-oxo- 5$\beta$-propionic acid-$\gamma$-lactone-6$\beta$,17$\beta$-hydroxy-4-androstan-17$\alpha$-yl) propionic acid $\gamma$-lactone (3).

A New Triterpene Lactone from the Roots of Patrinia scabiosaefolia

  • Yang, Mi-Young;Choi, Young-Hae;Yeo, Ho-Sup;Kim, Jin-Woong
    • Archives of Pharmacal Research
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    • v.24 no.5
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    • pp.416-417
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    • 2001
  • A new triterpene lactose named patrinolide A (7) has been isolated from the roots of Patrinia scabiosaefolia (Valerianaceae). Its structure was determined to be 11$\beta$,21$\beta$-dihydroxy-3-oxooleanan-28,13$\beta$-olide on the basis of spectral analysis, including 2D-NMR techniques.

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A New Sesquiterpene Lactone from Artemisia rubripes Nakai

  • Lee, Kyu-Ha;Min, Yong-Deuk;Choi, Sang-Zin;Kwon, Hak-Cheol;Cho, Ock-Ryun;Lee, Kang-Choon;Lee , Kang-Ro
    • Archives of Pharmacal Research
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    • v.27 no.10
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    • pp.1016-1019
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    • 2004
  • The chromatographic separation of a methylene chloride extract of Artemisia rubripes led to the isolation of a new sesquiterpene lactone (3), together with four known compounds, a coumarin (2) and three terpenes (1, 4, and 5). Their structures were characterized to be $1{\beta},6{\alpha}$- dihydroxy-4(15)-eudesmene (1), scopoletin (2), $1{\alpha},4{\beta}-dihydroxy-8{\alpha}$-acetoxy-guaia-2,10(14), 11(13)-triene-6,12-olide (3), $1{\alpha},4{\beta}$ -dihydroxy-8${\alpha}$-acetoxy-guaia-2,9,11(13)-triene-6,12-olide (4), and $\beta$ -sitosterol-3-O-${\beta}$-D-glycoside (5) by spectroscopic means.

The study of chemical substances in Hymenoxys brachyactis(II) (Hymenoxys brachyactis의 화학성분에 관한 연구(II))

  • Lee, Sang-Jun;Kim, Sung-Han;Kim, Jung-Han
    • Applied Biological Chemistry
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    • v.38 no.5
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    • pp.473-477
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    • 1995
  • The dichloromethane extracts of the above ground parts of Hymenoxys brachyactis afforded three sesquiterpene lactones already reported, one new sesquiterpene lactone, biennin C and hispidulin as known toxic flavone. Structures of all compounds were established by spectroscopy and biennin C was determined as an adduct of the modified pseudoguanolide and hymenoxon by Gas Chromatograpy and MS spectrometer These sesquiterpene lactones have the same ${\alpha},{\beta}$-unsaturated functional group like that of hymenovin which has been known as major toxic constituent of important livestock poison. And biennin C is also considered as toxic compound because of toxic hymenoxon.

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Two-Stage Microbial Biotransformation for the Production of 6-Dodecen-4-olide (Butter Lactone) from Plant Oils Containing Unsaturated Fatty Acids (불포화 지방산 함유 식물유를 이용한 천연 6-Dodecen-4-oilde (Butter Lactone) 생산을 위한 2-Stage Microbial Biotransformation)

  • Kwon, Soon-Hyang;Kim, Kyoung-Ju;Kim, Yang-Hwi Augustine
    • Korean Journal of Microbiology
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    • v.43 no.2
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    • pp.130-136
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    • 2007
  • Natural 6-dodecen-4-olide (Butte lactone) was produced from plant oils containing high unsaturated fatty acids via two-stage microbial hiotransformation. After unsaturated fatty acids were liberated from plant oil by microbial lipase, these were converted to optically active hydroxyl fatty acid (HFA) by hydroxylation reaction of Pseudomonas sp. NRRLB-2994. When safflower oil containing >75% unsaturated fatty acid, linoleoic acid wasused, Pseudomonas sp. produced 8g/L of 10-hydroxy-12(z)-octadecanoicacid with average of 39.2% bioconversion efficiency during 48 hr biotransformation period. The recovered 10-hydroxy-12-octadecanoic acid was further bioconverted to 4-hydroxy-6-dodecenoic acid via partial ${\beta}-oxidation$ by Yarriowia lipolytica ATCC34088. 4-hydroxy-6-dodecenoic acid in culture was lactonized by lowering pH to 4.0 using $4N\;H_{2}SO_{4}$ and heating for 5 min to 6-dodecen-4-olide (Butter lactone). Natural 6-dodecen-4-olide had characteristic aroma properties when compared to 6-dodecan-4-oilde (dodecalactone) and 4-decen-4-olide (decalactone).

Cytotoxic Constituents of the Leaves of Ixeris sonchifolia

  • Suh, Ji-Young;Jo, Young-Mi;Kim, Nam-Deuk;Bae, Song-Ja;Jung, Jee-H.;Im, Kwang-Sik
    • Archives of Pharmacal Research
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    • v.25 no.3
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    • pp.289-292
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    • 2002
  • The ethyl acetate extract of the leaves of Ixeris sonchifolia afforded two new and two known sesquiterpene lactone glucosides of the guaiane-type, together with a known alkenol glucoside. The known compounds were identified as ixerin Z (1), ixerin Z-6'-p-hydroxyphenylace-tate (2), and (Z)-3-hexen-1-ol-$\beta$-D-glucopyranoside (3), respectively. The structures of the new compounds were elucidated as 11, 13a-dihydroixerin Z [4, 3-hydroxy-2-oxo-guaia-1 (10), $3-dien-5{\alpha},6{\beta},7{\alpha},11{\beta}H-12,6-olide-3-O-{\beta}-D-glucopyranoside],{\;}and{\;}3,10{\$beta}-dihydroxy-2-oxo-guaia-3,11(13)-dien-1{\alpha},5{\alpha},6{\alpha},7aH-12,6-olide-10-O-{\beta}-D-glucopyranoside$ (5), respectively. The cytotoxicity of these compounds against human hepatocellular carcinoma cell (HepG2) and human melanoma cell (SK-MEL-2) was evaluated.

Stereospecific Synthesis of the (2R,3S)- and (2R,3R)-3-Amino-2-hydroxy-4-phenylbutanoic Acids from D-Glucono-δ-lactone

  • Lee, Jin Hwan;Kim, Jin Hyo;Lee, Byong Won;Seo, Woo Duck;Yang, Min Suk;Park, Ki Hun
    • Bulletin of the Korean Chemical Society
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    • v.27 no.8
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    • pp.1211-1218
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    • 2006
  • The enantiomerically pure (2R,3S)- and (2R,3R)-3-amino-2-hydroxy-4-phenylbutanoic acids (AHPBA) 1 and 3 are readily obtained from D-glucono-a-lactone. Both AHPBAs are the structural key units of KMI derivatives which are the potent inhibitors of BACE 1 ($\beta$-secretase) and HIV protease. Additionally, the obtained AHPBAs 1 and 3 are converted to dipeptides of bestatin stereoisomers 2 and 4.

Biochemical Characterization of an Extracellular ${\beta}$-Glucosidase from the Fungus, Penicillium italicum, Isolated from Rotten Citrus Peel

  • Park, Ah-Reum;Hong, Joo-Hee;Kim, Jae-Jin;Yoon, Jeong-Jun
    • Mycobiology
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    • v.40 no.3
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    • pp.173-180
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    • 2012
  • A ${\beta}$-glucosidase from Penicillium italicum was purified with a specific activity of 61.8 U/mg, using a chromatography system. The native form of the enzyme was an 88.5-kDa tetramer with a molecular mass of 354 kDa. Optimum activity was observed at pH 4.5 and $60^{\circ}C$, and the half-lives were 1,737, 330, 34, and 1 hr at 50, 55, 60, and $65^{\circ}C$, respectively. Its activity was inhibited by 47% by 5 mM $Ni^{2+}$. The enzyme exhibited hydrolytic activity for p-nitrophenyl-${\beta}$-D-glucopyranoside (pNP-Glu), p-nitrophenyl-${\beta}$-D-cellobioside, p-nitrophenyl-${\beta}$-D-xyloside, and cellobiose, however, no activity was observed for p-nitrophenyl-${\beta}$-D-lactopyranoside, p-nitrophenyl-${\beta}$-D-galactopyranoside, carboxymetyl cellulose, xylan, and cellulose, indicating that the enzyme was a ${\beta}$-glucosidase. The $k_{cat}/K_m\;(s^{-1}mM^{-1})$ values for pNP-Glu and cellobiose were 15,770.4 mM and 6,361.4 mM, respectively. These values were the highest reported for ${\beta}$-glucosidases. Non-competitive inhibition of the enzyme by both glucose ($K_i=8.9mM$) and glucono-${\delta}$-lactone ($K_i=11.3mM$) was observed when pNP-Glu was used as the substrate. This is the first report of non-competitive inhibition of ${\beta}$-glucosidase by glucose and glucono-${\delta}$-lactone.