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  1. 6541
    “…The A and B rings have chair conformations, whereas the C and D rings have envelope conformations; the two rings which contain the lactone and carbonyl bridge adopt chair and envelope conformations. …”
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    Gibberellin A4 monohydrate
  2. 6542
    “…The absolute configuration was inferred from the use of d-erythrono­lactone as the starting material.…”
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    tert-Butyl 2-de­oxy-4,5-O-isopropyl­idene-d-gluconate
  3. 6543
    “…The absolute configuration was determined by the use of d-glucorono-3,6-lactone as the starting material. The crystal structure consists of hydrogen-bonded chains of mol­ecules running parallel to the a axis. …”
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    (4R)-4-(2-Allyl-2H-1,2,3-triazol-4-yl)-1,2-O-isopropyl­idene-l-threose
  4. 6544
    “…Addition of methyl lithium to d-erythrono-1,4-lactone followed by acid deprotection was shown, by X-ray crystallography, to give 1-de­oxy-d-arabinitol, C(5)H(12)O(4), rather than 1-de­oxy-d-ribitol as the major product. …”
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    1-De­oxy-d-arabinitol
  5. 6545
    por Gao, Xue, Chen, Gang
    Publicado 2012
    “…The title compound, C(15)H(20)O(3), a sesquiterpene lactone, was isolated from the aerial parts of Carpesium minus Hemsl. …”
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    5α-Hy­droxy­eudesm-4(15),11(13)-dien-8β,12-olide
  6. 6546
    “…The trans-fused cyclo­hexane and γ-lactone rings of the α-santonin ring system adopt chair and envelope conformations, respectively, whereas the hexa­diene ring is approximately planar [maximum deviation = 0.029 (4) Å] and forms a dihedral angle of 62.30 (11)° with the benzene ring. …”
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    8-[(2-Hy­droxy­phen­yl)imino]-3,5a,9-trimethyl-3a,4,5,5a,8,9b-hexa­hydro­naphtho­[1,2-b]furan-2(3H)-one
  7. 6547
    “…Two new eudesmane-type sesquiterpenoid lactones, named chlorelactone A (1) and chlorelactone B (2), and one new labdane-type diterpenoid, named elatiorlabdane (3), along with seven known sesquiterpenoids and one known disesquiterpenoid were isolated from the whole plants of Chloranthus elatior. …”
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    Terpenoids from Chloranthus elatior
  8. 6548
    “…Cimyunnins A–C (1–3), characterized with an unusual fused cyclopentenone ring G, together with cimyunnin D (4), possessing a highly rearranged γ-lactone ring F, were characterized from the fruit of Cimicifuga yunnanensis. …”
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    New Anti-angiogenic Leading Structure Discovered in the Fruit of Cimicifuga yunnanensis
  9. 6549
    “…In recent years, a considerable number of structurally unique metabolites with biological and pharmacological activities have been isolated from the marine-derived fungi, such as polyketides, alkaloids, peptides, lactones, terpenoids and steroids. Some of these compounds have anticancer, antibacterial, antifungal, antiviral, anti-inflammatory, antioxidant, antibiotic and cytotoxic properties. …”
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    Potential Pharmacological Resources: Natural Bioactive Compounds from Marine-Derived Fungi
  10. 6550
    por Bray, Rodney A., Justine, Jean-Lou
    Publicado 2016
    “…A new species of Hamacreadium Linton, 1910, H. cribbi n. sp. is described from Lethrinus miniatus (Forster) from the waters off New Caledonia. …”
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    Hamacreadium cribbi n. sp. (Digenea: Opecoelidae) from Lethrinusminiatus (Forster) (Perciformes: Lethrinidae) from New Caledonian waters
  11. 6551
    “…The starting materials for the reductions are, respectively, 1,2-O-isopropylidene-d-glucurono-6,3-lactone, 5-aldo-1,2-O-isopropylidene-d-xylo-pentofuranose, and 2,3:5,6-di-O-isopropylidene-d-mannofuranose. …”
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    Tritium-Labeled Compounds IV. d-Glucose-6-t, d-Xylose-5-t, and d-Mannitol-1-t
  12. 6552
    “…The conformation of both 5-membered lactone and furanose fused rings is also discussed.…”
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    Preparation Crystal Structure of (1S, 5S, 7S, 8R)-8-Hydroxy-7-phenyl-2,6-dioxabicyclo[3.3.0]octan-3-one
  13. 6553
    por Michalska, Klaudia, Kisiel, Wanda
    Publicado 2008
    “…This is the first time that the known phenolics syringaldehyde and syringaresinol, as well as the known sesquiterpene lactones glucozaluzanin C, cichorioside C and hypochoeroside A have been described from a Picris species. …”
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    The First Guaian-12-oic Acid Glucopyranosyl Ester and Other Constituents from Picris rhagadioloides (L.) Desf. (Asteraceae)
  14. 6554
    “…Five known sesquiterpene lactones with the eudesmane skeleton have been isolated and the cytotoxic activity of these compounds was tested in vitro on A549 (human lung carcinoma epithelial-like) and V79379A (Chinese hamster lung fibroblast-like) cells using the tetrazolium salt reduction (MTT) assay. …”
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    Cytotoxic Effect of Eudesmanolides Isolated from Flowers of Tanacetum vulgare ssp. siculum
  15. 6555
    “…The key features of this synthesis include Evans anti-aldol reaction for the installation of C-2 and C-3 stereocenters and cycloetherification via epoxide opening followed by concomitant lactonization for the construction of tetrahydrofuran and γ-butyrolactone scaffolds. …”
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    Total Synthesis of Cytospolide Q
  16. 6556
    “…Through an intramolecular Michael addition, δ‐lactones are obtained as products. Two distinct ligand classes are identified that enable the challenging palladium‐catalyzed activation of free carboxylic acids in the γ‐position. …”
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    Ligand‐Enabled γ‐C(sp(3))−H Olefination of Free Carboxylic Acids
  17. 6557
    “…This case explores Apligraf (Organogenesis Inc., Canton, Massachusetts) as an alternative treatment for full-thickness skin injuries in the pediatric population. …”
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    Apligraf as an Alternative to Skin Grafting in the Pediatric Population
  18. 6558
    “…Compared to the previous lactone reagent the stereopreference switches almost completely, proving the fact that the nature of the organometallic compound is of immense importance for the asymmetry of the product. …”
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    Asymmetric Allylation Catalyzed by Chiral Phosphoric Acids: Stereoselective Synthesis of Tertiary Alcohols and a Reagent‐Based Switch in Stereopreference
  19. 6559
    “…The reaction proceeds via cascade C–H activation, carbene insertion, and intramolecular lactonization. The reaction exhibits high atom economy, good functional group tolerance, and high regioselectivity. …”
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    One-pot construction of diverse and functionalized isochromenoquinolinediones by Rh(iii)-catalyzed annulation of unprotected arylamides with 3-diazoquinolinediones and their application for fluorescence sensor
  20. 6560
    “…[Image: see text] Commercially available and inexpensive lithium tert-butoxide ((t)BuOLi) acts as a good precatalyst for the hydroboration of esters, lactones, and epoxides using pinacolborane as a borylation agent. …”
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    (t)BuOLi-Promoted Hydroboration of Esters and Epoxides
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