[CH3:1][O:2][C:3]1[CH:21]=[CH:20][C:6]2[N:7]=[C:8]([C:10]3[CH:19]=[CH:18][C:17]4[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=4)[CH:11]=3)[S:9][C:5]=2[C:4]=1[N+:22]([O-])=O.[H][H]>CO.C(O)(=O)C.[Pd]>[CH3:1][O:2][C:3]1[CH:21]=[CH:20][C:6]2[N:7]=[C:8]([C:10]3[CH:19]=[CH:18][C:17]4[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=4)[CH:11]=3)[S:9][C:5]=2[C:4]=1[NH2:22]1.06 g (3.15 mmol) of 6-methoxy-2-(2-naphthyl)-7-nitro-1,3-benzothiazole are put into suspension in 50 ml of methanol and 5 ml of acetic acid. 105 mg (10%) of palladium on carbon is added to the reaction mixture which is maintained under stirring under 2.5 bars of hydrogen for 24 hours. The catalyst is filtered, then the solvents are evaporated under reduced pressure. 0.51 g (yield=53%) of 6-methoxy-2-(2-naphthyl)-1,3-benzothiazol-7-amine is obtained and used in the following stage without other purification.
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