AMINODIHYDROTHIAZINE DERIVATIVE SUBSTITUTED WITH CYCLIC GROUP

摘要

PROBLEM TO BE SOLVED: To provide an intermediate (ab) for producing an aminodihydrothiazine derivative that is useful as a remedy for the diseases induced by the production, secretion or deposition of amyloid &bgr;protein.SOLUTION: There is provided a compound or salts thereof expressed by formula (ab) (the cycle A is phenyl or optionally substituted pyridine; Ris a methyl group; and Rand Rare each hydrogen, a halogen, or optionally substituted lower alkyl, or Rand Rmay form a carbocyclic ring together with the adjoining carbon atom).