[CH3:1][N:2]([C:12]1[S:13][C:14]2[N:22]=[CH:21][CH:20]=[CH:19][C:15]=2[C:16](=[O:18])[N:17]=1)[C:3]1[CH:8]=[CH:7][C:6]([N+:9]([O-])=[O:10])=[CH:5][CH:4]=1.[H][H]>[Pd].CN(C=O)C>[OH:10][NH:9][C:6]1[CH:7]=[CH:8][C:3]([N:2]([C:12]2[S:13][C:14]3[N:22]=[CH:21][CH:20]=[CH:19][C:15]=3[C:16](=[O:18])[N:17]=2)[CH3:1])=[CH:4][CH:5]=1A mixture of 1.181 g (3.76 mmol) of 2-[N-methyl-N-(4-nitrophenyl)amino]-4H-pyrido[3,2-e]-1,3-thiazin-4-one obtained in Example 63, 100 ml of DMF and 250 mg of 10% Pd on carbon was stirred in an atmosphere of hydrogen for 6 days. The reaction mixture was then heated so that the compound thus precipitated was dissolved. The insoluble matters were hot-removed by filtration. The solution thus obtained was then allowed to cool to room temperature. The resulting crystal was collected by filtration, washed with THF and then with ethanol, and then dried under reduced pressure to obtain 77 mg of 2-[N-(4-hydroxyaminophenyl)-N-methylamino]-4H-pyrido[3,2-e]-1,3-thiazin-4-one.
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