Preparation of haloisatoic anhydrides

Details Preparation of haloisatoic anhydrides Preparation of haloisatoic anhydrides

1988-09-02

1990-01-30

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen in the nitrogen containing substituent

C07D26526

Patent

active

048974781

ABSTRACT:
Haloisatoic anhydrides are prepared by halogenating appropriately unsubstituted isatoic anhydrides with elemental chlorine or bromine in the presence of chlorosulfonic acid at from -10.degree. C. to +100.degree. C. using not less than 0.5 mole of halogen per mole of isatoic anhydride.

REFERENCES:
patent: 4306074 (1981-12-01), Tonne et al.
patent: 4316020 (1982-02-01), Reissenweber
patent: 4328339 (1982-05-01), Kilpper et al.
Chemical Abstracts, Band 100, No. 25, 18. Jun. 1984, Columbus, Ohio, USA Suesse, M.; Johne S. "Quinazolinecarboxylic acids. 2. Quinazolin-4-on-2-ylacetaimdes" Seite 589, Spalte 1, Ausammen.-fassung-Nr. 209 731s & Z. Chem. 1983,23 (11), 406-407.
Chemical Abstracts, Band 101, No. 7, 13 Aug. 1984, Columbus, Ohio, USA Suesse, M.; Johne, S. "Quinazolinecarbozylic acids. I. Quinazolin-4-one(2,4-dione)-3-acetic acids and esters" Seite 619, Spalte 1, Zusammenfassung-Nr. 55 043a & J. Prakt. Chem. 1984, 326 (2).

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