Cl.[CH3:2][O:3][NH:4][CH3:5].[Cl-].C[Al+]C.[Cl:10][C:11]1[CH:16]=[CH:15][C:14]([CH2:17][CH:18]([C:23]2[CH:28]=[CH:27][CH:26]=[C:25]([F:29])[CH:24]=2)[C:19](OC)=[O:20])=[CH:13][CH:12]=1>C(Cl)Cl>[CH3:2][O:3][N:4]([CH3:5])[C:19](=[O:20])[CH:18]([C:23]1[CH:28]=[CH:27][CH:26]=[C:25]([F:29])[CH:24]=1)[CH2:17][C:14]1[CH:13]=[CH:12][C:11]([Cl:10])=[CH:16][CH:15]=1To a suspension N-methoxy-N-methylamine hydrochloride (2.0 g, 21 mmol) in 50 mL CH2Cl2 at 0° C. was added dimethylaluminum chloride (1 M in hexane, 21 mL, 21 mmol). After stirring at room temperature for 1 h, a solution of methyl 3-(4-chlorophenyl)-2-(3-fluorophenyl)propionate (Step A, 2.0 g, 10 mmol) in CH2Cl2 (10 mL) was added, and the resulting mixture was stirred overnight. The reaction mixture was quenched by addition of MeOH (5 mL), and the resulting mixture was concentrated with silica gel (50 g). The material was loaded onto a silica gel column, which was eluted with 10% EtOAc in hexane to 2% ammonia in MeOH (2 M) in 10% EtOAc/hexane to give the title compound. 1H NMR (400 MHz, CD3OD): δ 7.35-6.90 (m, 8H), 4.39 (br, 1H), 3.41 (s, 3H), 3.38-3.30 (m, 1H), 3.08 (s, 3H), 2.92 (dd, 1H). LC-MS: m/e 322 (M+H)+ (3.6 min).
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