Hydrochloric Acid → Methyl 4-(1-diphenylmethoxycarbonylvinyl)-2,3,5,6-tetrafluorobenzoate

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Reaktionsschritte

In 175 ml of methylene chloride was dissolved 35.0 g of methyl 4-(1-diphenylmethoxycarbonyl-2-hydroxyethyl)-2,3,5,6-tetrafluorobenzoate. To the solution was added 7.9 g of methanesulfonyl chloride with ice-cooling. Into the mixture was dropped 16.8 g of triethylamine in 10 minutes. The resulting mixture was stirred at the same temperature for 1 hour, and 200 ml of water was added to the reaction mixture. The resulting mixture was adjusted to pH 1 with 2N hydrochloric acid. The organic layer was separated, washed with water and a saturated aqueous sodium chloride solution in this order, and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure to obtain 33.0 g (yield: 97.9%) of methyl 4-(1-diphenylmethoxycarbonylvinyl)-2,3,5,6-tetrafluorobenzoate.

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