Cyanobenzenesulfenyl halide and process for preparation of 3-substituted benzisothiazole using the same
AssigneeSumitomo Seika Chemicals Co., Ltd.
InventorsHiroshi Goda, Junichi Sakamoto, Shigeki Sakaue, Sakae Kajihara, Miki Todo
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Abstract
The present invention provides a compound represented by the general formula (I): ##STR1## wherein X represents Cl or Br, a process for preparation of the same and a process for preparation of 3-substituted benzisothiazole by reaction of the compound (I) with a piperazine compound.
Claims4
A process for preparation of 3-substituted benzisothiazole represented by the general formula (IV):
- ##STR7## wherein R.sub.2 represents H, alkyl group having 1 to 6 carbon atoms or substituted alkylene group having 1 to 6 carbon atoms, which comprises reacting 2-cyanobenzenesulfenyl halide represented by the general formula (I) with a piperazine compound represented by the general formula (III):
- ##STR8## wherein R.sub.2 is as defined for the general formula IV.
A process for preparation of 3-substituted benzisothiazole represented by the general formula (IV), which comprises halogenating a 2-cyanophenylthio derivative represented by the general formula (II) to obtain 2-cyanobenzenesulfenyl halide represented by the general formula (I), then reacting the halide represented by the general formula (I) with a piperazine compound represented by the general formula (III).
Dependencies are inferred from the claim text.