2,3-dihydrobenzofuran is a fine chemical raw material, widely used in the synthesis of tricyclic compounds, and is also the intermediate material for the synthesis of some important drugs found in recent years. 2,3-dihydrobenzofuralbook is the intermediate material of antitumor preparations benzofurasulfonylurea compounds L1, HIV protease inhibitor amino acid hydroxyethylsulfonyl, matrix metalloproteinase inhibitor aryl sulfosamide hydroxamic acid, etc.