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  1. 6721
    por Xu, Jiaxi
    Publicado 2023
    “…They are phosphorus analogues of lactams and lactones and important biologically active compounds. …”
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    Synthesis of medium and large phostams, phostones, and phostines
  2. 6722
    “…Four new meroterpenoids, Clavilactone M-P, possessing novel aminoglycoside moiety (1–4) and a 10-membered carbocycle fused with an α,β-epoxy-γ-lactone, were isolated from Clitocybe clavipes, a basidiomycete. …”
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    Four Meroterpenoids with Novel Aminoglycoside Moiety from the Basidiomycete Clitocybe clavipes with Cytotoxic Activity
  3. 6723
    “…The effects of ethanol concentration, extraction time, temperature and number of extraction steps on the extraction yields of both sesquiterpene lactones were investigated. Gas chromatographic (GC) method was used for simultaneous determination of their contents in the corresponding extracts. …”
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    Ultrasound-assisted extraction of alantolactone and isoalantolactone from Inula helenium roots
  4. 6724
    “…In contrast, some of these compounds were active in the quorum-sensing-tests. γ-Lactones showed a broad reactivity, while pyrazines seem to have only low intrinsic activity. …”
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    Biological Activity of Volatiles from Marine and Terrestrial Bacteria
  5. 6725
    “…The title compound, C(15)H(18)O(3), was synthesized from 9α-hy­droxy­parthenolide (9α-hy­droxy-4,8-dimethyl-12-methyl­ene-3,14-dioxatricyclo­[9.3.0.0(2,4)]tetra­dec-7-en-13-one), which was isolated from the chloro­form extract of the aerial parts of Anvillea radiata. The five-membered lactone ring has a twisted conformation, while the six- and five-membered rings display chair and envelope conformations, respectively. …”
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    5,8-Dimethyl-3-methyl­ene-2-oxo-3,3a,4,5,5a,6,8a,8b-octa­hydro-2H-1-oxa-s-indacene-5-carbaldehyde
  6. 6726
    “…The five-membered ring formed by the lactone group, which bridges from the A/B to the B/C ring junctions, is an approximate envelope with the C atom of the methyne group as the flap [displacement from the other four atoms = 0.753 (2) Å]. …”
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    4,4,6a,6b,11,12,14b-Heptamethyl-16-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,9,10,11,12,12a,14a,14b-octa­deca­hydro-12b,8a-(epoxy­methano)­picen-3-yl acetate
  7. 6727
    “…The lactone ring in the title mol­ecule, C(15)H(22)O(3) (systematic name: 3,4a,8-tri­methyl­dodeca­hydro­azuleno[6,5-b]furan-2,5-dione), assumes an envelope conformation with the methine C atom adjacent to the the methine C atom carrying the methyl substituent being the flap atom. …”
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    Crystal structure of pseudoguainolide
  8. 6728
    “…The title compound, C(13)H(13)NO(4) (also known as N-benzyl­oxycarbonyl-4-hy­droxy-l-proline lactone), crystallizes with two mol­ecules in the asymmetric unit. …”
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    Crystal structure of benzyl 3-oxo-2-oxa-5-aza­bicyclo­[2.2.1]heptane-5-carboxyl­ate
  9. 6729
    “…Here we demonstrate that the hydrophobic signal N-hexadecanoyl-L-homoserine lactone, which is produced by Paracoccus sp., is released from cells by the aid of membrane vesicles (MVs). …”
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    Membrane vesicle-mediated bacterial communication
  10. 6730
    “…Two new lactone-containing selaginellins T and U (1 and 2) together with eleven known selaginellin derivatives (3 and 7–16) were isolated from the whole plant of Selaginella tamariscina. …”
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    A biomimetic semisynthesis enables structural elucidation of selaginellin U: a tautomeric cyclic alkynylphenol from Selaginella tamariscina
  11. 6731
    “…Group I, with 48 strains, possessed 53 group-specific genes including the gassericin T cluster (9 genes) and N-acyl homoserine lactone lactonase. Group II, with 27 strains, including the type strain ATCC 33323, possessed group-specific genes with plasmid- or phage-related annotations. …”
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    Revealing the genomic differences between two subgroups in Lactobacillus gasseri
  12. 6732
    “…By treating with histone-deacetylase inhibitor valproate sodium, three new heterdimeric tetrahydroxanthone–chromanone lactones chrysoxanthones A–C (1–3), along with 17 known compounds were isolated from a sponge-associated Penicillium chrysogenum HLS111. …”
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    Chrysoxanthones A–C, Three New Xanthone–Chromanone Heterdimers from Sponge-Associated Penicillium chrysogenum HLS111 Treated with Histone Deacetylase Inhibitor
  13. 6733
    “…The effect of psilostachyin, a natural sesquiterpene lactone, on the growth and viability of cultured epimastigotes of Trypanosoma cruzi (Tulahuen) is reported. …”
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    Antiproliferative Effect and Ultrastructural Alterations Induced by Psilostachyin on Trypanosoma cruzi
  14. 6734
    “…all-endo-3-amino-5-hydroxybicyclo[2.2.2]octane-2-carboxylic acid (13) and all-endo-5-amino-6-(hydroxymethyl)bicyclo[2.2.2]octan-2-ol (10) were prepared via dihydro-1,3-oxazine or γ-lactone intermediates by the stereoselective functionalization of an N-protected derivative of endo-3-aminobicyclo[2.2.2]oct-5-ene-2-carboxylic acid (2). …”
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    Synthesis and Transformations of di-endo-3-Aminobicyclo-[2.2.2]oct-5-ene-2-carboxylic Acid Derivatives
  15. 6735
    “…The reactions catalyzed by a water-soluble Ru(II)-Amm-Pheox catalyst proceeded smoothly at room temperature, affording the corresponding bicyclic cyclopropane ring-fused lactones and lactams in high yields (up to 99%) with excellent enantioselectivities (up to 99% ee). …”
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    Reusable and highly enantioselective water-soluble Ru(II)-Amm-Pheox catalyst for intramolecular cyclopropanation of diazo compounds
  16. 6736
    “…All analogs exhibited a variable degree of β-glucuronidase inhibitory activity with IC(50) values ranging in between 0.8 ± 0.1–42.3 ± 0.8 μM when compared with the standard d-saccharic acid 1,4 lactone (IC(50) = 48.1 ± 1.2 μM). Structure activity relationship has been established for all compounds. …”
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    Synthesis of Chromen-4-One-Oxadiazole Substituted Analogs as Potent β-Glucuronidase Inhibitors
  17. 6737
    “…In this mini-review, we have focused on efforts to engineer enzymes that disrupt quorum sensing by inactivating acyl-homoserine lactone signalling molecules. We review different approaches for protein engineering and provide examples of how these engineering approaches have been used to tailor the stability, specificity and activities of quorum quenching enzymes. …”
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    Engineering quorum quenching enzymes: progress and perspectives
  18. 6738
    “…Cyclobutene lactones hold great potential as synthetic building blocks, yet their preparation by photochemical rearrangement in batch can often be a bottleneck in synthetic studies. …”
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    Towards a Scalable Synthesis of 2‐Oxabicyclo[2.2.0]hex‐5‐en‐3‐one Using Flow Photochemistry
  19. 6739
    “…Withanolides are steroidal lactones widespread in Nightshade plants with often potent antiproliferative activities. …”
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    Isolation and characterisation of irinans, androstane-type withanolides from Physalis peruviana L.
  20. 6740
    “…Interestingly, depending on the diol substrate, these reactions result in formation of either lactones or hydroxy acids. For example, diethylene glycol could be selectively and fully converted into 2‐(2‐hydroxyethoxy)acetic acid. …”
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    Production of Hydroxy Acids: Selective Double Oxidation of Diols by Flavoprotein Alcohol Oxidase
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