[Cl:1][C:2]1[CH:13]=[CH:12][C:5]([C:6](N(OC)C)=[O:7])=[C:4]([NH:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[CH:3]=1.[CH2:21]([Mg]Br)[CH3:22].CCCCCC.C(OCC)(=O)C>C1COCC1>[Cl:1][C:2]1[CH:13]=[CH:12][C:5]([C:6](=[O:7])[CH2:21][CH3:22])=[C:4]([NH:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[CH:3]=1
To a solution of 4-chloro-N-methoxy-N-methyl-2-phenylamino-benzamide (5.0 g, 17.2 mmol) in THF (60 mL) was added ethylmagnesium bromide (1M solution in THF, 70 mL, 70 mmol) dropwise at 0° C. under nitrogen. The mixture was slowly warmed to room temperature and stirred for 2 hr. Completion of the reaction was monitored by silica TLC (mobile phase; hexane:ethyl acetate=4:1; Rf=0.5). Reaction was quenched with an aqueous solution of 1N HCl (50 mL) at 0° C. and was extracted with ethyl acetate (2×300 mL). The combined organic layers were washed with water (100 mL), brine (100 mL), dried over anhydrous Na2SO4, and concentrated under reduced pressure. The crude material was purified using silica gel (100-200 mesh) column chromatography, using gradient polarity mobile phase (ethyl acetate:hexane=1:91:4), to give 1-(4-chloro-2-phenylamino-phenyl)-propan-1-one (4.15 g, 92.9% yield) as a yellow oil. 1H NMR (DMSO-d6) δ ppm 10.53 (s, 1H) 8.00 (d, J=8.7 Hz, 1H) 7.34-7.51 (m, 2H) 7.28 (d, J=7.7 Hz, 2H) 7.13-7.23 (m, 1H) 7.07 (d, J=1.8 Hz, 1H) 6.82 (dd, J=8.6, 1.9 Hz, 1H) 3.07 (q, J=7.2 Hz, 2H) 1.09 (t, J=7.3 Hz, 3H).
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