[OH-].[K+].Cl.[NH2:4]O.[CH2:6]([S:13][C:14]1[CH:23]=[CH:22][CH:21]=[CH:20][C:15]=1[C:16]([O:18][CH3:19])=O)[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.[C:24](=[O:27])([O-])[O-].[K+].[K+].BrCCBr>CO>[CH2:6]([S:13][C:14]1[CH:23]=[CH:22][CH:21]=[CH:20][C:15]=1[C:16]1[O:18][CH2:19][CH2:24][O:27][N:4]=1)[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1160 g (2.86 mol) of potassium hydroxide in 700 ml of methanol are added dropwise, at room temperature, to a mixture of 98.7 g (1.42 mol) of hydroxylamine hydrochloride and 700 ml of methanol. Subsequently, 184 g (0.712 mol) of methyl 2-(benzylthio)benzoate are added in portions at room temperature. The mixture is stirred at 40° C. overnight. 98.1 g (0.712 mol) of potassium carbonate are then added, 601 g (3.20 mol) of 1,2-dibromoethane are added dropwise, and the mixture is left stirring at 60° C. overnight. Subsequently, the solvent is distilled off under reduced pressure. The residue is partitioned between methylene chloride and water. The organic phase is dried and the solvent is distilled off under reduced pressure. The residue is stirred up with absolute ethyl alcohol. The solid is filtered off with suction and dried under high vacuum. 43.1 g (21% of theory) of 1-benzylthio-2-(5,6-dihydro-[1,4,2]-dioxazin-3-yl)benzene are obtained as a pale yellow solid. Melting point: 73°-77° C.
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