Preparation of 2,3-dioxo-1,4-benzoxazine derivatives

Details Preparation of 2,3-dioxo-1,4-benzoxazine derivatives Preparation of 2,3-dioxo-1,4-benzoxazine derivatives

1980-11-03

1981-10-27

Randolph, John D.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

42424857, C07D26532

Patent

active

042974917

ABSTRACT:
A process for the preparation of a 2,3-dioxo-1,4-benzoxazine derivative of the formula I ##STR1## where R.sup.1 and R.sup.2 are identical or different and each is hydrogen, alkyl, halogen, haloalkyl, alkoxy, haloalkoxy or nitro, by oxidizing an isatin of the formula II ##STR2## where R.sup.1 and R.sup.2 have the above meanings, with a peroxydisulfate dissolved or suspended in 30-98% strength sulfuric acid.
The 2,3-dioxo-1,4-benzoxazine derivatives obtainable by the novel process have fungicidal or fungistatic properties.

REFERENCES:
patent: 3238201 (1966-03-01), Scherrer
Honkanen et al., Chem. Abstracts, vol. 60, col. 1076 e et seq. (1964), (Abst. of Acta Chem. Scand. vol. 14, pp. 1214-1217 (1960).
Alexandrou et al., Chem. Abstracts, vol. 72, Abst. 3465c (1970), (Abst. of J. Chem. Soc. C 1969, pp. 2319-2321).
Dickore et al., Chem. Abstracts, Abst. No. 132645k (1970), (Abst. of Ann. Chem. vol. 733, pp. 70-87 (1970).
Dickore et al., Annalen der Chemie, vol. 733, pp. 70-87 (1970).
Chemical Abstracts, Fifth Decennial Index (1947-1956, vols. 41-50), Subjects Hy-Ly, p. 6820s.

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