Method for preparing 4-substituted-N-methylbenzothiazolone deriv

Details Method for preparing 4-substituted-N-methylbenzothiazolone deriv Method for preparing 4-substituted-N-methylbenzothiazolone deriv

1979-06-18

1981-10-06

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

424270, C07D27768, A61K 31425

Patent

active

042937027

ABSTRACT:
A process for producing N-alkylbenzothiazolone derivatives of the formula (I), ##STR1## wherein R.sub.1 is a hydrogen, chlorine, bromine, fluorine atom or a methyl group, and R.sub.2 is an alkyl group having 1 to 5 carbon atoms, from 2-halogenobenzothiazole derivatives of the formula (II), ##STR2## wherein R.sub.1 is as defined above and X is a chlorine, bromine or fluorine atom, which is a starting material, through the intermediate of 2-alkoxybenzothiazole derivatives of the formula (III), ##STR3## wherein R.sub.1 and R.sub.2 are as defined above, or benzothiazolone derivatives of the formula (IV), ##STR4## wherein R.sub.1 is as defined above.

REFERENCES:
Hunter et al., "J. Chem. Soc.", pp. 1755-1761 (1935).

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