反应详情

A solution of 8.1 g (29.1 mmol) of ethyl 3-(2, 3,4,5-tetrafluoro-6-methylphenyl)-β-oxopropanoate, 7.2 g (43.3 mmol) of triethyl orthoformate, and 70 mL of acetic anhydride was refluxed for 3.5 hours. The solution was cooled to room temperature and concentrated under high vacuum to give 9.1 g of the title compound. The product was used as is in the next step.

1. concentrationconcentrated under high vacuum