Results 11 to 20 of about 44,043 (291)

Hemisynthesis and Absolute Configuration of novel 6-pentyl-2H-pyran- 2-one derivatives from Trichoderma spp [PDF]

, 2009
A comparative study of the secondary metabolism of two Trichoderma spp. with that of the Thctf1 transcription factor gene null mutant of Trichoderma harzianum 34 was carried out in order to deepen our knowledge of the biosynthetic pathway and mode of ...
Benitez, Bisby, Bull, Cardoza, Chattannavar, Claydon, Collins, Cooney, Cooney, Cristina Pinedo-Rivilla, Cutler, Dickinson, Djonovic, Enrique Monte, Evidente, Freire, Gloer, Harman, Ichikawa, Ichikawa, Isidro G. Collado, Ivanchina, Josefina Aleu, Keszler, Khatib, Lorito, M. Belén Rubio, Monte, Mourad Daoubi, Muratake, Nair, Ollis, Poole, Reino, Rosa Hermosa, Rubio, Sanz, Serrano-Carreon, Thibonnet, Vinale, Winne   +40 more
core   +4 more sources

Selective Oxygenation of 3,4-Dihydro-2H-Pyran to 5,6-Dihydro-2H-Pyran-2-One With Pd/C Catalyst and Molecular Oxygen. [PDF]

ChemSusChem
Selective oxygenation: The oxidation of 3,4‐dihydro‐2H‐pyran, which can be produced from lignocellulose‐derived furfural, was investigated with various catalysts using O2 as an oxidant in a H2O solvent. 5,6‐dihydro‐2H‐pyran‐2‐one, a value‐added product, was obtained in 52% yield with reusable Pd/C catalyst.
Kawabata N, Yabushita M, Tomishige K, Nakagawa Y.   +3 more
europepmc   +2 more sources

Methyl (6R*,6aR*,12bR*)-2,4-dimethyl-6-(2-methylphenyl)-1,3-dioxo-2,3,4,6a,7,12b-hexahydro-1H,6H-chromeno[4′,3′:4,5]pyrano[2,3-d]pyrimidine-6a-carboxylate

IUCrData, 2017
In the title compound, C24H24N2O6, the mean planes of the pyran rings (A and B) are inclined to one another by 69.2 (1)°, while the aromatic ring (D) of the chromene ring system makes dihedral angles of 63.42 (11) and 66.81 (12)° with the pyrimidine (C ...
S. Gomathi, Era Dravida Thendral, G. Sivakumar, V. Sabari, G. Usha   +4 more
doaj   +1 more source

Synthesis, cytotoxic and anti-proliferative activity of novel thiophene, thieno[2,3-b]pyridine and pyran derivatives derived from 4,5,6,7-tetrahydrobenzo[b]thiophene derivative

Acta Chimica Slovenica, 2017
Novel tetrahydrobenzo[b]thienopyrole derivatives were synthesized from 2-amino-3-cyano-4,5,6,7-tetrahydrobenzo[b]thiophene (1) through its reaction with α-chloroacetone to give the corresponding N-alkyl derivative 3.
Rafat Milad Mohareb, Nadea Youssef Megally Abdo, Fatma Omar Al-farouk   +2 more
doaj   +1 more source

Extending Human Perception of Electromagnetic Radiation to the UV Region through Biologically Inspired Photochromic Fuzzy Logic (BIPFUL) Systems. [PDF]

, 2015
Photochromic Fuzzy Logic Systems have been designed that extend human visual perception into the UV region. The systems are founded on a detailed knowledge of the activation wavelengths and quantum yields of a series of thermally reversible photochromic ...
Albus, Albus, Amanda L. Rightler, B. Mark Heron, Brou, Christopher D. Gabbutt, Conway, Delbaere, di Nunzio, Gegenfurtner, Gentili, Gentili, Gentili, Gentili, Gentili, Gust, Hepworth, Hunt, Lennie, Li, Ling, Lokshin, Ludlow, Maafi, Marshall, Monroy, Pier Luigi Gentili, Solomon, Sung, Szaciłowski, Tovée, Wu, Zadeh, Zadeh, Zeki, Zeki   +35 more
core   +1 more source

The crystal structures and Hirshfeld surface analysis of 6-(naphthalen-1-yl)-6a-nitro-6,6a,6b,7,9,11a-hexahydrospiro[chromeno[3′,4′:3,4]pyrrolo[1,2-c]thiazole-11,11′-indeno[1,2-b]quinoxaline] and 6′-(naphthalen-1-yl)-6a′-nitro-6′,6a′,6b′,7′,8′,9′,10′,12a′-octahydro-2H-spiro[acenaphthylene-1,12′-chromeno[3,4-a]indolizin]-2-one

Acta Crystallographica Section E: Crystallographic Communications, 2019
The title compounds, 6-(naphthalen-1-yl)-6a-nitro-6,6a,6 b,7,9,11a-hexahydrospiro[chromeno[3′,4′:3,4]pyrrolo[1,2-c]thiazole-11,11′-indeno[1,2-b]quinoxaline], C37H26N4O3S, (I), and 6′-(naphthalen-1-yl)-6a′-nitro-6′,6a′,6b′,7′,8′,9′,10′,12a′-octahydro-2H ...
G. Foize Ahmad, A. Syed Mohammed Mujaheer, M. NizamMohideen, M. Gulam Mohamed, V. Viswanathan   +4 more
doaj   +1 more source

Stereoselective protecting group free synthesis of d,l-gulose ethyl glycoside via multicomponent enyne cross metathesis—hetero Diels–Alder reaction [PDF]

, 2009
An efficient and stereoselective synthesis of d,l-gulose was described. The key step of the synthetic route is represented by a multicomponent enyne cross metathesis—hetero Diels–Alder reaction which allows the formation of the pyran ring from cheap and ...
Aoyagi, Boger, Boger, Bonini, Castagnolo, Chuit, Daniele Castagnolo, Dondoni, Furin, Giessert, Katano, Lorenzo Botta, Maimone, Maurizio Botta, Meyer zu Reckendorf, Minster, Petitou, Schaefer, Sinay, Takahashi, Tollefsen, Trachtenberg, Umezawa   +22 more
core   +1 more source

The synthesis of 4H-pyran containing hemispherands via pyrylium salts [PDF]

, 1986
Two new hemispherands 2a and 2b containing a central 4H-pyran unit were synthesized via appropiately substituted 2,6-phenyl pyrylium salts; largest ΔGo values of complexation of 2a and 2b with different alkali picrates are found for Na+ and K+
Dijkstra, P.J., Hams, B.H.M., Hertog, H.J. den, Reinhoudt, D.N., Steen, B.J. van   +4 more
core   +2 more sources

Mechanism and Application of Baker–Venkataraman O→C Acyl Migration Reactions [PDF]

, 2014
This literature review focuses on the O→C acyl migration of aryl esters to yield the corresponding 1,3-dicarbonyl products—a reaction known as the Baker–Venkataraman rearrangement—and outlines their subsequent transformations.
Ameen, Dana, Snape, Timothy James
core   +1 more source

Phenolic Compounds in Bacterial Inactivation: A Perspective from Brazil

Antibiotics, 2023
Phenolic compounds are natural substances that are produced through the secondary metabolism of plants, fungi, and bacteria, in addition to being produced by chemical synthesis.
Angélica Correa Kauffmann, Vinicius Silva Castro   +1 more
doaj   +1 more source