Results 131 to 140 of about 1,143 (191)
Some of the next articles are maybe not open access.
The “Benzothiazine” Chromophore of Pheomelanins: A Reassessment†
Photochemistry and Photobiology, 2007AbstractThe characteristic absorption and photochemical properties of pheomelanins are generally attributed to “benzothiazine” structural units derived biogenetically from 5‐S‐cysteinyldopa. This notion, however, conveys little or no information about the structural chromophores responsible for the photoreactivity of pheomelanins.
NAPOLITANO, ALESSANDRA +3 more
openaire +4 more sources
A novel photoisomerzation of 1,2‐benzothiazine 1,1‐dioxides to 1,3‐benzothiazine 1,1‐dioxides
Journal of Heterocyclic Chemistry, 2007AbstractA novel facile photoconversion of 4‐hydroxy‐1,2‐bezothiazine 1,1‐dioxides (3a‐e) into 4‐oxo‐1,3‐2H‐benzothiazine 1,1‐dioxides (4a‐e) and 4‐hydroxy‐2‐methyl‐N‐(pyridin‐2‐yl)‐2H‐1,2‐benzothiazine‐3‐carboxamide 1,1‐dioxide (PRX) into N‐methyl saccharin (2) upon 254 nm irradiation in methanol or acetonitrile is reported.
Ibrahim Elghamry +2 more
openaire +1 more source
1,4-Benzothiazines, Dihydro-1,4-benzothiazines, and Related Compounds.
1985Publisher Summary The benzothiazines constitute a group of heterocyclic compounds; they have found a variety of industrial uses and show promise as herbicides. This chapter discusses the chemistry of 1,4-benzothiazines and dihydro-1,4-benzothiazines. The 1,4-benzothiazine ring is the basic unit for the phaeomelanins and trichochrome melanin pigments ...
C. Brown, R.M. Davidson
openaire +1 more source
Rearrangement of benzothiazine sulphoxides
Journal of the Chemical Society D: Chemical Communications, 1970The reaction of substituted benzothiazine sulphoxides with Ac2O under reflux leads by an elimination reaction to a sulphenic acid derivative which undergoes subsequent addition to the generated double bond if the nitrogen is tertiary but is trapped as a cyclic sulphenamide by a secondary nitrogen.
Robert B. Morin, Douglas O. Spry
openaire +1 more source
Benzothiazines in Synthesis. Formal Synthesis of Erogorgiaene.
ChemInform, 2005A benzothiazine, readily available in enantiomerically pure form via a completely selective, intramolecular addition of a sulfoximine-stabilized carbanion to an α,β-unsaturated ester, could be converted to a precursor to erogorgiaene in good overall yield.
Michael Harmata, Xuechuan Hong
openaire +1 more source
1,4-Benzothiazines-A Biologically Attractive Scaffold
Mini-Reviews in Medicinal Chemistry, 20171,4-benzothiazine (1,4-B), a pharmacophore of anti-psychotic drug phenothiazines, is a vital class of heterocyclic compounds implicating versatile biological activities. The aim of this review article is to summarize various synthetic strategies, biological activities and structure activity relationship concerning the bioactive heterocycle, 1,4-B ...
Amit, Rai +3 more
openaire +2 more sources
A New, Chiral Bis-Benzothiazine Ligand
Organic Letters, 2001[reaction: see text]. The synthesis and application of a new, chiral bis-benzothiazine ligand are described.
M, Harmata, S K, Ghosh
openaire +2 more sources
Benzothiazines in Synthesis. Toward the Synthesis of Pseudopteroxazole
Organic Letters, 2004[reaction: see text] The tricyclic benzothiazine 15 was prepared in a straightforward fashion via a completely stereoselective intramolecular Friedel-Crafts alkylation. This compound represents a potential precursor to the antitubercular agent, pseudopteroxazole.
Michael, Harmata +2 more
openaire +2 more sources
Chemistry of Heterocyclic Compounds, 1979
Data on the methods for the synthesis of 1,3-benzothiazines and their derivatives and their chemical properties and physiological activity are correlated.
openaire +1 more source
Data on the methods for the synthesis of 1,3-benzothiazines and their derivatives and their chemical properties and physiological activity are correlated.
openaire +1 more source
ChemInform, 2008
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Michael Harmata +2 more
openaire +1 more source
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Michael Harmata +2 more
openaire +1 more source