In the presence of catalytic amounts of cesium chloride, using DMF as solvent, sodium (potassium) carboxylates reacted with α-chloroacetates at room temperature or reacted with alkyl bromides (chlorides) at 60 ℃ to give the corresponding (α-alkoxyformacyl)methyl carboxylic esters and carboxylic esters in >90% yields. The catalytic mechanism was discussed.
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