[F:1][C:2]1[CH:3]=[C:4]([CH:9]=[CH:10][CH:11]=1)[O:5][CH2:6][CH2:7][NH2:8].C(=O)([O-])[O-].[K+].[K+].[Br:18][CH2:19][C:20](Br)=[O:21].O>ClCCl>[Br:18][CH2:19][C:20]([NH:8][CH2:7][CH2:6][O:5][C:4]1[CH:9]=[CH:10][CH:11]=[C:2]([F:1])[CH:3]=1)=[O:21]A mixture of 2-(3-fluorophenoxy)ethylamine (0.93 g) and potassium carbonate (1.24 g in dichloromethane (20 mL) at 0° C. was treated with bromoacetyl bromide (1.04 mL). The reaction mixture was stirred at 0° C. for 30 mins then at room temperature for 6 h. Water was added and the mixture was stirred until effervescence ceased. The organic layer was separated and the organic layer was evaporated to afford the crude product which was purified by silica gel chromatography eluting with 0-50% EtOAc/pentane to give the sub-titled compound (1.17 g) as a brown oil.
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