Results 141 to 150 of about 3,633 (196)

Benzothiazines in organic synthesis. Synthesis of fluorescent 7-amino-2,1-benzothiazines

Organic & Biomolecular Chemistry, 2011
Fluorescent 7-amino-2,1-benzothiazines were prepared in high yields using the palladium-catalyzed reaction of 4-amino-2-chlorobenzaldehydes with a sulfoximine or the reaction of 7-fluoro-2,1-benzothiazines with amines.
Nattawut, Yongpruksa, Siddharth, Pandey, Gary A, Baker, Michael, Harmata   +3 more
openaire   +2 more sources

A novel photoisomerzation of 1,2‐benzothiazine 1,1‐dioxides to 1,3‐benzothiazine 1,1‐dioxides

Journal of Heterocyclic Chemistry, 2007
AbstractA 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, Dietrich Doepp, Gerald Henkel   +2 more
openaire   +1 more source

1,4-Benzothiazines, Dihydro-1,4-benzothiazines, and Related Compounds.

1985
Publisher 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, 1970
The 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

Synthesis and β-Adrenergic Blocking Activity of 1,4-Benzothiazine Oxime Ethers

European Journal of Medicinal Chemistry, 1989
Synthesis of 6-, 7-, 8-acetimidoyloxypropanolamines of 3,4-dihydro-3-oxo-2 H-1,4-benzothiazine and 8-iminoxypropanolamines of 3,4,5,6,7,8-hexahydro-3-oxo-2 H-1,4-benzothiazine are reported.
Violetta Cecchetti, Arnaldo Fravolini
exaly   +2 more sources

Benzothiazines in Synthesis. Formal Synthesis of Erogorgiaene.

ChemInform, 2005
A 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, 2017
1,4-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, Ashok K, Singh, Vinit, Raj, Sudipta, Saha   +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
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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, Xuechuan, Hong, Charles L, Barnes   +2 more
openaire   +2 more sources

1,3-Benzothiazines (review)

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