[CH3:1][O:2][C:3](=[O:10])[C:4]([CH2:6][N:7]([CH3:9])[CH3:8])=[CH2:5].CO[CH2:13][N:14]([CH2:20][C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1)[CH2:15][Si](C)(C)C.FC(F)(F)C(O)=O.C([O-])(O)=O.[Na+]>ClCCl>[CH3:1][O:2][C:3]([C:4]1([CH2:6][N:7]([CH3:9])[CH3:8])[CH2:5][CH2:13][N:14]([CH2:20][C:21]2[CH:22]=[CH:23][CH:24]=[CH:25][CH:26]=2)[CH2:15]1)=[O:10]
To a cold solution of 2-dimethylaminomethyl-acrylic acid methyl ester (0.266 g, 1.86 mmol) and N-(methoxymethyl)-N-(trimethylsilylmethyl)benzyl-amine (1.43 ml, 5.59 mmol) in dichloromethane (25 ml) was added at 0° C. trifluoroacetic acid (83 μl, 1.12 mmol). The resulting solution was warmed to room temperature and stirred for 72 hours. Saturated aq. NaHCO3 (60 ml) was added to the reaction mixture and stirred for 10 minutes. Diluted with dichloromethane (50 ml) and the organic layer was separated. The organic layer was dried over Na2SO4, filtered and concentrated. The crude product was purified by column chromatography on silica get eluting with a solution of ethyl acetate in hexanes (1:2) followed by CH2Cl2/MeOH/NH4OH (9/1/0.01) to give the title compound (400 mg, 78%).
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