p-Toluenesulfonic acid monohydrate → ((1-(Benzyloxy)-3-chloropropan-2-yl)oxy)methyl propionate

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反応手順

204.0 g of 3-benzyloxy-1-chloro-2-propanol, 660 ml of hexane, 626.3 g of methoxymethyl propionate and 5.79 g of p-toluenesulfonic acid mono-hydrate were placed into a 2-liter 3-neck round bottom flask equipped with a thermometer, mechanical stirrer, nitrogen inlet and an efficient distillation column. The reaction mixture was heated to reflux. The distillate was taken off at about 10:1 to 15:1 reflux ratio keeping the head temperature below 60° C. Samples were taken to monitor the progress of the reaction. The reaction was quenched when the desired level of methyl acetal was reached which is usually less than about 4% methyl acetal. The quench was carried out by rapidly adding a solution of 11.55 g of sodium carbonate in 310 ml of water directly to the hot reaction mixture. The aqueous layer was washed with additional water and/or base to remove any residual propionic acid. The volatiles were removed to leave the crude product as a mobile liquid. Yield: 285.2 g, (97.8%); 92.6% pure.

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