Dimethylformamide dimethyl acetal → Ethyl 2-(5-bromo-2,4-dimethoxybenzoyl)-3-dimethylaminoacrylate

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Under a nitrogen atmosphere, ethyl 3-(5-bromo-2,4-dimethoxyphenyl)-3-oxopropionate (52.8 g) obtained in Step 3 of Example 1 and N,N-dimethylformamide dimethyl acetal (44.6 g) were dissolved in toluene. The solution was stirred at 95° C. for 16 hr, and the completion of the reaction was confirmed by HPLC. The reaction mixture was cooled to room temperature to give a solution of ethyl 2-(5-bromo-2,4-dimethoxybenzoyl)-3-dimethylaminoacrylate in toluene. The reaction mixture was directly used in the next step.

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