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Unexpected conversion of 4-oxo-4H-chromene-2-carboxylic acid to 2-(1,3-benzothiazol-2-yl)-4H-chromen-4-one and spiro[1,4-benzothiazine-2,2 '-chromene]-3,4 '(3 ' H,4H)-dione

Title
Unexpected conversion of 4-oxo-4H-chromene-2-carboxylic acid to 2-(1,3-benzothiazol-2-yl)-4H-chromen-4-one and spiro[1,4-benzothiazine-2,2 '-chromene]-3,4 '(3 ' H,4H)-dione
Type
Article in International Scientific Journal
Year
2022
Authors
Fernando Cagide
(Author)
FCUP
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Gomes, LR
(Author)
Other
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Low, JN
(Author)
Other
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Fernanda Borges
(Author)
FCUP
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Journal
The Journal is awaiting validation by the Administrative Services.
Vol. 58
Pages: 68-72
ISSN: 0009-3122
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Publicação em ISI Web of Knowledge ISI Web of Knowledge - 0 Citations
Publicação em Scopus Scopus - 0 Citations
Other information
Authenticus ID: P-00W-38W
Abstract (EN): 2-(1,3-Benzothiazol-2-yl)-4H-chromen-4-one and spiro[1,4-benzothiazine-2,2'-chromene]-3,4'(3'H,4H)-dione have been synthesized from 4-oxo-4H-chromene-2-carboxylic acid. The course of the reaction that usually occurs between the activated carboxylic acid and aromatic amines was changed upon the use of different reaction conditions (acidic or basic) and 2-aminobenzenethiol. As a result, new heterocyclic derivatives were obtained. Structures of the compounds have been established on the basis of spectral (1D and 2D NMR spectra) and X-ray data.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 5
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