Results 101 to 110 of about 7,497 (214)

Synthesis of the Tetracyclic Spiro-naphthoquinone Chartspiroton

Organic Letters
Chartspiroton is a recently discovered naphthoquinone natural product that features a spiro-fused benzofuran lactone. We report its first synthesis via an 11-step linear sequence. The sterically hindered tetra-ortho-substituted biaryl subunit was installed by base-induced ring expansion of a readily available 1,3-indandione.
Röder, Liesa, Wurst, Klaus, Magauer, Thomas   +2 more
openaire   +3 more sources

Novel naphthoquinones from Conospermum incurvum

, 1994
During the reisolation of the trimeric naphthoquinone derivative conocurvone [1] from an extract of the Australian shrub Conospermum incurvum, six monomeric naphthoquinones were isolated. These include three novel 1,4-naphthoquinone derivatives: 3-methyl-
Decosterd, L. A., Boyd, M. R., Cardellina, J. H., 2nd,, Dai, J. R., Gray, G. N., Gustafson, K. R.   +5 more
core   +1 more source

The Chemical Biology of Naphthoquinones and Its Environmental Implications

, 2012
Quinones are a group of highly reactive organic chemical species that interact with biological systems to promote inflammatory, anti-inflammatory, and anticancer actions and to induce toxicities.
Takashi Miura, Yasuhiro Shinkai, Arthur K. Cho, Yoshito Kumagai   +3 more
core   +1 more source

Recent advances on naphthoquinone-imidazolyl and naphthoquinone-thiazolyl derivatives as photoinitiators of photopolymerization

European Polymer Journal
Visible light photopolymerization is facing a revolution with the development of energy-efficient light sources, namely LEDs. With the ongoing efforts to develop photoinitiating systems outperforming the existing ones in terms of polymerization rates and monomer conversions, the search for new families of dyes that have not been investigated yet in the
openaire   +1 more source

Naphthoquinones from the roots of Aloe secundiflora

, 2012
Two new naphthoquinones, 5-hydroxy-3,6-dimethoxy-2-methylnaphthalene-1,4-dione and 5,8-dihydroxy-3-methoxy-2-methylnaphthalene-1,4-dione, were isolated from the roots of Aloe secundiflora together with the known compounds chrysophanol, helminthosporin ...
Yenesew, Abiy, Wanjohi, John M., Wasuna, Antonina, Wekesa, Ingrid, Induli, Martha, Cheloti, Michael, Byamukama, Robert, Heydenrich, Matthias, Makayoto, Moses   +8 more
core   +1 more source

The Mechanistic Study of Substitutionof Halogenated Naphthoquinones

, 2002
Substituted naphthoquinones and their analogues, such as streptonigrin, are known to be involved in various important biochemical processes. It has been suggested that they are beneficial in the prevention of tumors in several major organs.
Stadler, Sarah J.
core  

Cobaltaphotoredox catalysed synthesis of spiro compounds: utilizing the inherent photoredox properties of naphthoquinones

A sustainable external photocatalyst-free cobaltaphotoredox catalysed direct spiroannulation of naphthoquinones utilizing the inherent sensitizing and photoredox properties of naphthoquinones.
Upendra Sharma, Tamanna Sharma, Sachin
core   +1 more source

Reactions of 1,4-naphthoquinones with Nucleophiles

, 2011
Derivatives of 1,4-naphthoquinone play an important role in various biological processes through their extensive reactivity with nucleophiles. The reaction of vitamin K3, 2-methyl-1,4-naphthoquinone with a nucleophilic cysteine residue in the active site
Kim, Tiffany
core  

Photochemistry of Naphthoquinones

Revista Virtual de Química, 2015
Nanci C. de Lucas, Aurélio B. B. Ferreira, José Carlos Netto-Ferreira   +2 more
openaire   +1 more source

Quantum Theoretical, Chemo-Computational, and Comparative Molecular Coupling Studies of Two Enantiomeric Naphthoquinones, Alkannin and Shikonin, and Their Corresponding Indole Derivatives. [PDF]

Molecules
Rivera Espejel AL, Lira SB, Miranda Ruvalcaba R, Escobedo-González RG, Cuevas-Cruz M, Fajardo de la Rosa AA, Nieto-Álvarez DA, Martínez J, Nicolás-Vázquez MI.   +8 more
europepmc   +1 more source