Results 31 to 40 of about 737,596 (164)
New Sorbicillinoids from the Mangrove Endophytic Fungus Trichoderma reesei SCNU-F0042
Marine Drugs, 2023 Three new dimeric sorbicillinoids (1–3) and one new 3,4,6-trisubstituted α-pyrone (5), along with seven analogues (4 and 6–11), were isolated from the mangrove endophytic fungus Trichoderma reesei SCNU-F0042 under the guidance of molecular networking ...
Jialin Li +5 more
doaj +1 more source
2-Oxo-2H-chromen-3-yl 4-tert-butylbenzoate
IUCrData, 2016 In the title coumarin derivative, C20H18O4, the benzene ring of the benzoate group is oriented at a dihedral angle of 57.55 (9)° with respect to the planar chromene ring system [maximum deviation from plane is 0.027 (2) Å].
Konan René Kambo +4 more
doaj +1 more source
Convergent Total Synthesis of 16β‐Hydroxylpseudobufarenogin
Angewandte Chemie, Volume 138, Issue 23, 1 June 2026.We present a novel convergent strategy that integrates Pd/Ag‐promoted Suzuki–Miyaura coupling with Ir‐catalyzed radical‐relay cyclization, enabling the first total synthesis of 16β‐hydroxylpseudobufarenogin. This approach is broadly applicable to the total synthesis of various oxygenated bufadienolides by simply modifying the fragment structures ...
Wataru Shigematsu +3 more
wiley +2 more sources
Antileukemic α-pyrone derivatives from the endophytic fungus Alternaria phragmospora. [PDF]
Tetrahedron Lett, 2014 Four new (-) and two known ( and ) α-pyrone derivatives have been isolated from , an endophytic fungus from , leaves. The isolated compounds were chemically identified to be 5-butyl-4-methoxy-6-methyl-2-pyran-2-one (), 5-butyl-6-(hydroxymethyl)-4-methoxy-
Metwaly AM +7 more
europepmc +2 more sources
Isothiourea-mediated one-pot synthesis of trifluoromethyl substituted 2-pyrones
, 2014 The authors thank the Royal Society for a University Research Fellowship (ADS) and the EPSRC (EP/J018139/1, DSBD) for funding.A one-pot isothiourea-mediated Michael addition/lactonization/thiol elimination cascade sequence for the formation of 4,6 ...
Smith, Andrew D. +9 more
core +1 more source
Probing Photochemically and Thermally Induced Isomerization Reactions in α-Pyrone [PDF]
, 2016 The isomerization dynamics of α-pyrone dissolved in CH3CN have been probed by femtosecond 267 nm pump/broadband infrared (IR) probe spectroscopy. A novel experimental setup allowed the populations of the parent molecule and ring-opened photoproducts to ...
Murdock, Daniel +5 more
core +1 more source
Beilstein Journal of Organic Chemistry, 2009 Pd/C-mediated alkynylation of 5-iodo-pyrazole-4-carboxylic acid, involving the first regioselective construction of α-pyrone ring on a pyrazol moiety via tandem coupling–cyclization process, has been developed to afford pyrano[4,3-c]pyrazol-4(1H)-one in ...
Dhilli Rao Gorja +3 more
doaj +1 more source
, 1964 The Kostanecki acylation of 4-methyl-6-ethyl-8-acetylumbelliferone furnishes two compounds: (A) C18H16O3. m.p. 198°, and (B) C16H14O4. m.p. 335°. Compound (A) on hydrolysis with caustic alkali furnishes (i) an acid, C13H15O5, m.p.
K. A. Thakar
core +1 more source
, 2016 An elimination and stereoselective hydrogenation of α-d-glucoheptonic-γ-lactone derivative has been applied to prepare a differentially protected anti,anti-1,3,5-triol system, the utility of which has been extended for the total synthesis of anti-fungal ...
C. V. Ramana (1787043) +3 more
core +2 more sources
Beilstein Journal of Organic Chemistry, 2016 The α-pyrone moiety is a structural feature found in a huge variety of biologically active metabolites. In recent times new insights into additional biosynthetic mechanisms, yielding in such six-membered unsaturated ester ring residues have been obtained.
Till F. Schäberle
doaj +1 more source