Results 81 to 90 of about 17,659,431 (225)

Activation of the Nuclear Factor E2-Related Factor 2 Pathway by Novel Natural Products Halomadurones A–D and a Synthetic Analogue

Marine Drugs, 2013
Two novel chlorinated pyrones, halomadurones A and B, and two novel brominated analogues, halomadurones C and D, were isolated from a marine Actinomadura sp. cultivated from the ascidian Ecteinascidia turbinata.
Thomas P. Wyche, Miranda Standiford, Yanpeng Hou, Doug Braun, Delinda A. Johnson, Jeffrey A. Johnson, Tim S. Bugni   +6 more
doaj   +1 more source

Density functional study of 4-pyrone and 2-pyrone

, 2003
7-10Density functional (B3LYP) calculations using 6-31 G* have been made to estimate the bond lengths and angles for 4-pyrone and 2-pyrone. The predicted bond lengths and angles for 4-pyrone are in excellent agreement with experimental results ...
Ralhan, Sonia, Ray, N K, Shukla, Piyush K   +2 more
core  

7,7′-Dihydroxy-4,4′-dimethyl-3,4-dihydro-2H,2′H-4,6′-bichromene-2,2′-dione

Acta Crystallographica Section E, 2011
The title compound, C20H16O6, which contains one chiral centre, crystallizes as a racemate. The mean planes of the two coumarin units make a dihedral angle of 88.07 (2)°.
M. Ramos Silva, Ali Mohammed Malla, Akhtar Ali, Mehtab Parveen, P. S. Pereira Silva   +4 more
doaj   +1 more source

Synthetic and Structure-Activity Relationship of Insecticidal Bufadienolides

Natural Product Communications, 2014
A new synthetic analog of bufadienolide, methyl isobryophyllinate A ( 1 ), and a known synthetic analog, methyl isobersaldegenate-1,3,5-orthoacetate ( 2 ), were obtained by methanolysis of bryophyllin A ( 3 ) and bersaldegenin-1,3,5-orthoacetate ( 5 ) in
Ace Tatang Hidayat, Achmad Zainuddin, Danar Dono, Wawan Hermawan, Hideo Hayashi, Unang Supratman   +5 more
doaj   +1 more source

Verrucisidinol and Verrucosidinol Acetate, Two Pyrone-Type Polyketides Isolated from a Marine Derived Fungus, Penicillium aurantiogriseum

Marine Drugs, 2010
The new secondary metabolites verrucosidinol (1) and its derivative verrucosidinol acetate (2), together with a potent neurotoxin verrucosidin (3), a congener norverrucosidin (4) and a mixture of two known phytotoxic metabolites terrestric acids (5 and 6)
Huanqin Dai, Lixin Zhang, Fuhang Song, Jinsheng Sun, Caixia Chen, Junli Wei, Biao Ren, Ke Yu   +7 more
doaj   +1 more source

Photoinduced transformation of matrix-isolated methyl 2-pyrone-3-carboxylate into methyl 2-pyrone-5-carboxylate via intramolecular hydrogen shift in open-ring aldehyde–ketene

, 2008
Photochemical transformations of methyl 2-pyrone-3-carboxylate (mp3c) were studied by matrix-isolation technique. The dominating primary photoreaction induced by UV (λ > 295 nm) light was α-bond cleavage leading to open-ring aldehyde–ketene.
Lapinski, Leszek, Reva, Igor, Nowak, Maciej J., Fausto, Rui   +3 more
core   +1 more source

Edge functionalization of graphene layers with a 2-pyrone [PDF]

, 2021
Conversion of hydrolyzed biomass, mainly composed by carbohydrates, into suitable building blocks is one of the major purposes of Green Chemistry, defined as ‘‘the design of chemical products and processes to reduce or eliminate the use and generation of
Maurizio Galimberti, Vincenzina Barbera, Fatima Margani   +2 more
core  

Gombapyrones E and F, New α-Pyrone Polyenes Produced by Streptomyces sp. KMC-002

Molecules, 2011
Microorganism-derived polyene polyketides have been shown to display a variety of biological activities and have attracted great interest due to their structurally intriguing chemical diversity.
Kang Ro Lee, Hak Cheol Kwon, Hyun Ok Yang, Hyun Bong Park   +3 more
doaj   +1 more source

Synthesis of 2-pyrone containing products and Hibiscone C

, 2018
2-Pyrone is extremely prevalent in numerous natural products with a broad range of biological activities. Not only structurally complex natural products, but more and more 2-pyrone containing small molecules have also attracted the attention of organic ...
Qu, Yang
core   +1 more source

Diels−Alder Cycloadditions of 3,5-Dibromo-2-pyrone:  A New Ambident Diene

, 2016
D−A cycloadditions of 3,5-dibromo-2-pyrone were investigated with a series of electronically and sterically distinct dienophiles. Our results showed that it is a highly potent ambident diene, being more reactive and stereoselective than monobromo-2 ...
Jung-Sang Park (3030399), Yong-Woo Kim (3030402), Sangman Koo (3030396), Haiwon Lee (1546915), Cheon-Gyu Cho (1725187), Young-Kwan Lim (2143927)   +5 more
core   +2 more sources