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Journal of the Brazilian Chemical Society

Print version ISSN 0103-5053On-line version ISSN 1678-4790


BOECHAT, Núbia et al. N-Acyl-3,3-difluoro-2-oxoindoles as versatile intermediates for the preparation of different 2,2-difluorophenylacetic derivatives. J. Braz. Chem. Soc. [online]. 2008, vol.19, n.3, pp.445-457. ISSN 1678-4790.

This paper describes the versatility of N-Acyl-3,3-difluoro-2-oxoindoles, obtained from the the reaction of N-acylisatins with (diethylamino)sulphur trifluoride (DAST) which, on opening of the heterocyclic ring by reactions with nucleophiles, lead to the formation of a variety of products: reaction with water yields 2-(2-amidoacyl)-2,2-difluoroacetic acids, with alcohols yields alkyl 2-(2-amidoacyl)-2,2-difluoroacetates, with amines and glycine yields 2-(2-amidoacyl)-2,2-difluoroacetamides and with thiosemicarbazides yields difluorothiosemicarbazide derivatives. The latter undergo acid-catalysed cyclizations to yield N-(2-((5-aminoaryl-1,3,4-thiadiazol-2-yl)difluoromethyl)-4-(R)-phenyl)acetamide. The X-ray structure of N-(2-((5-amino-1,3,4-thiadiazol-2-yl)difluoromethyl)-4-methylphenyl)acetamide has been determined.

Keywords : isatins; DAST; deoxo-fluor; 1,3,4-thiadiazoles; 3,3-difluoro-2-oxoindoles; N-acyl-3,3-difluoro-2-oxoindoles.

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