1-methoxy-N,N,N',N'-tetramethylmethylenediamine → Methyl 2-[4-(benzyloxy)phenyl]-3-dimethylamino-2-propenoate

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According to a modified literature procedure (Wasserman, H. H.; Ives, J. L. J. Org. Chem. 1985, 50, 3573–3580) a solution of 1.0 g (3.9 mmol) of (4-benzyloxy-phenyl)-acetic acid methyl ester in 4 mL of toluene was flushed with argon. To this solution was added 0.842 mL g (5.5 mmol) of methoxy bis(dimethylamino)methane, and the resulting mixture was stirred at 65° C. under argon overnight. The reaction mixture was concentrated to give 1.21 g of desired 2-(4-benzyloxy-phenyl)-3-dimethylamino-acrylic acid methyl ester as indicated by 1H NMR (containing traces of starting material). The product was used without any further purification in the next step.

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