[Cl:1][C:2]1[CH:14]=[CH:13][CH:12]=[CH:11][C:3]=1[CH2:4][C:5]1[O:10][CH2:9][CH2:8][O:7][N:6]=1.[Br:15]N1C(=O)CCC1=O.C(OCC)(=O)C.CCCCCC>C(Cl)(Cl)(Cl)Cl.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1>[Cl:1][C:2]1[CH:14]=[CH:13][CH:12]=[CH:11][C:3]=1[CH:4]([Br:15])[C:5]1[O:10][CH2:9][CH2:8][O:7][N:6]=14.0 g (19 mmole) of 3-(2-chlorobenzyl)-5,6-dihydro-1,4,2-dioxazine (prepared as described in Preparation 1) were dissolved in 40 ml of carbon tetrachloride, and then 4.1 g (23 mmole) of N-bromosuccinimide and 0.2 g of benzoyl peroxide were added to the solution, which was then stirred, whilst heating, for 8 hours. At the end of this time, 100 ml of ethyl acetate and 100 ml of hexane were added to the solution, and the mixture was stirred at room temperature for 30 minutes; insolubles were then removed by filtration. The filtrate was concentrated by evaporation under reduced pressure, to give 4.8 g of the title compound as a yellow oil.
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