Chlorotrimethylsilane → 1-((4-Bromo-2-methoxyphenyl)(2-hydroxy-6-oxocyclohex-1-enyl)methyl)-3-(3-(trifluoromethyl)phenyl)urea

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A mixture of cyclohexane-1,3-dione (700 mg, 6.24 mmol), 4-bromo-2-methoxybenz-aldehyde (1.35 g, 6.28 mmol) and 1-(3-(trifluoromethyl)phenyl)urea (1.27 g, 6.24 mmol) in N,N-dimethylformamide (2.0 mL) and acetonitrile (3.0 mL) is stirred at room temperature for 20 min Trimethylsilyl chloride (1 M in dichloromethane, 9.0 mL, 9.0 mmol) is added, and the mixture is stirred at room temperature for 30 min and poured into ice water. The mixture is stirred for 3 h and concentrated under reduced pressure. The residue is purified by reversed phase HPLC (Waters Xbridge™-C18, gradient of acetonitrile in water, 0.1% NH3). Yield: 900 mg; ESI mass spectrum [(79Br)-M+H]+=513, [(81Br)-M+H]+=515; Retention time HPLC: 0.68 min (Z011_S03).

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