CO[CH2:3][N:4]([CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[CH2:5][Si](C)(C)C.[Cl:17][C:18]1[CH:19]=[C:20](/[CH:25]=[CH:26]/[C:27](=[O:29])[CH3:28])[CH:21]=[CH:22][C:23]=1[Cl:24].FC(F)(F)C(O)=O>C(Cl)Cl>[CH2:10]([N:4]1[CH2:3][CH:25]([C:20]2[CH:21]=[CH:22][C:23]([Cl:24])=[C:18]([Cl:17])[CH:19]=2)[CH:26]([C:27](=[O:29])[CH3:28])[CH2:5]1)[C:11]1[CH:12]=[CH:13][CH:14]=[CH:15][CH:16]=1A solution of N-(methoxymethyl)-N-(phenylmethyl)-N-(trimethylsilyl)methylamine (32.78 g, 0.138 mol) in CH2Cl2 (50 mL) was added drop wise, over a 30 minutes period, to a stirred solution of (E)-4-(3,4-dichloro-phenyl)-but-3-en-2-one (CAS RN: 55420-70-7) (19.80 g, 0.092 mol) and trifluoroacetic acid (1.05 mL, 0.009 mol) in CH2Cl2 (100 mL) at 0° C. The ice bath was removed, and the solution was stirred at 25° C. for an additional 48 h. It was then concentrated and purification by flash chromatography (SiO2, CH2Cl2/MeOH 98:2) afforded the title compound (28.3 g, 88%) as a yellow oil. ES-MS m/e: 348.2 (M+H+).
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