[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]2[S:13][C:12]3[CH:14]=[CH:15][C:16]4[C:21]([C:11]=3[NH:10][CH2:9]2)=[CH:20][CH:19]=[CH:18][CH:17]=4)=[CH:4][CH:3]=1.C(=O)([O-])O.[Na+].O.[C:28](Cl)(=[O:31])[CH:29]=[CH2:30]>C(Cl)Cl>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]2[S:13][C:12]3[CH:14]=[CH:15][C:16]4[C:21]([C:11]=3[N:10]([C:28](=[O:31])[CH:29]=[CH2:30])[CH2:9]2)=[CH:20][CH:19]=[CH:18][CH:17]=4)=[CH:6][CH:7]=1To a mixture of 3-(4-chlorophenyl)-2,3-dihydro-1H-naphtho[2,1-b][1,4]thiazine (1.50 g), sodium hydrogen carbonate (1.0 g), methylene chloride (30 ml) and water (15 ml) is added dropwise with stirring a solution of acryloyl chloride (0.90 g) in methylene chloride (10 ml) under ice cooling. The mixture is stirred at room temperature for 3 hours. The organic layer is separated, washed, dried and distilled to remove the solvent. The residue is chromatographed on silica gel (toluene: acetone =50 : 1) to give 3-(4-chlorophenyl)-1-propenoyl-2,3-dihydro-1H-naphtho[2,1-b][1,4]thiazine (1.37 g, 78%) as powder.
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