Ethyl orthoformate → 2,2-Bis((benzyloxy)methyl)-1,3-dioxolane

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Reaction Conditions

Reaction Steps

The 1,3-bis(benzyloxy)acetone (30 g, 111 mmol) obtained in the step (4a) was mixed with ethylene glycol (64 ml, 1.148 mmol) and triethyl orthoformate (19 ml, 114 mmol), and p-toluenesulfonic acid monohydrate (591 mg, 3.11 mmol). The mixture was stirred at 50° C. for 14 hours. To the mixture, a saturated aqueous solution of sodium hydrogen carbonate and ethyl acetate were added. The organic layer was washed with water and a saline solution, dried over anhydrous sodium sulfate, and concentrated. The obtained crude product was purified by silica gel column chromatography (elution solvent: heptane/ethyl acetate=1/0-4/1 gradient) and desired fractions were concentrated to obtain the title compound (28.46 g, yield: 81.6%) as a colorless oil.

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