Process for preparing 2-aminobenzothiazoles

Details Process for preparing 2-aminobenzothiazoles Process for preparing 2-aminobenzothiazoles

1986-06-25

1988-01-12

Ceperley, Mary E.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D27782

Patent

active

047193042

ABSTRACT:
Process for preparing 2-aminobenzothiazoles of the formula (1) ##STR1## in which R.sub.1 and R.sub.2 denote hydrogen or halogen atoms or alkyl.sub.C1-C4, alkoxy.sub.C1-C4 or nitro groups, by reacting phenylthioureas of the formula (2) ##STR2## in which R.sub.1 and R.sub.2 have the abovementioned meanings, at temperatures of 20.degree. C. to 130.degree. C. in 70-100% strength sulfuric acid in the presence of catalytic amounts of bromine, hydrogen bromide, sodium bromide, potassium bromide or ammonium bromide which comprises carrying out the reaction in the presence of a finely divided solid which has a large specific surface area and is inert under the reaction conditions.

REFERENCES:
patent: 4113732 (1978-09-01), Opgenorth et al.
patent: 4363913 (1982-12-01), Clark et al.
patent: 4563533 (1986-01-01), Rentel et al.
Nippon Kayaku, Derwent and Japio abstracts of Japanese Patent Application 57-9774, published Jan. 19, 1982.
G. Hawley, Condensed Chemical Dictionary, Tenth Edition, p. 920 (1981), QDSC32.
E. Rideal, Concepts in Catalysis, Chapter 2, p. 5 (1968), Academic Press, NY.

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