Process for the preparation of 2(3H)-benzothiazolones

Details Process for the preparation of 2(3H)-benzothiazolones Process for the preparation of 2(3H)-benzothiazolones

1994-04-25

1997-01-14

Gerstl, Robert

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548165, C07D27768

Patent

active

055941451

ABSTRACT:
The process for the preparation of 2(3H)-benzothiazolones which are optionally substituted on the benzene ring by reacting a 2-aminobenzothiazole which is optionally substituted on the benzene ring with a diazotization agent in the presence of aqueous hydrochloric acid, if appropriate with addition of a chloride, to give a diazonium chloride, reacting the diazonium chloride directly to give a 2-chlorobenzothiazole, which is optionally substituted on the benzene ring, and hydrolyzing the 2-chlorobenzothiazole, without intermediate isolation, at 120.degree.-200.degree. C. under reaction pressure.

REFERENCES:
patent: 3888871 (1985-07-01), Lowe
European Search Report, Jul. 13, 1994, No. 94 106 198.8.
Elderfield, J. Org. Chem. 18 1092 (1953).
Erlenmeyer, Helv. Chim Acta, 27 1432 (1944).

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