Process for the preparation of 2-aminobenzothiazoles

Details Process for the preparation of 2-aminobenzothiazoles Process for the preparation of 2-aminobenzothiazoles

1993-11-16

1994-12-20

Brust, Joseph Paul

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D27782

Patent

active

053747372

ABSTRACT:
A process for the preparation of a 2-aminobenzothiazol of the formula ( I ) ##STR1## in which R.sub.1 and R.sub.2 independently of each other are hydrogen, fluorine, chlorine, bromine or iodine, trifluoromethyl or C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or nitro groups, by conversion of an arylthiourea of the formula (II) in which R.sub.1 and R.sub.2 have the meaning mentioned, which comprises carrying out the conversion in 99 to 100% strength of sulfuric acid with continuous addition of catalytic amounts of bromine, hydrogen bromide or bromide in the form of aqueous solutions and using an arylthiourea of the formula (II) which contains 1 to 35% water.

REFERENCES:
patent: 4363913 (1982-12-01), Clark et al.
patent: 4719304 (1988-01-01), Rentil et al.
Chemical Abstracts, vol. 96, No. 25, 1982; abstract No. 217832q, p. 744; Zusammenfassung & JP-A-82 009 774 (Nippon Kayaku Co Ltd) Jan. 19, 1982.

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