Chemistry is traditionally divided into organic and inorganic chemistry. Application In Synthesis of Ethyl 3-oxo-2,3-dihydrobenzofuran-2-carboxylate, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 13099-95-1
3-Methoxybenzofuran-2-carbohydrazide (3), obtained from 2-carbethoxy-3-methoxybenzofuran (2), undergoes condensation isothiocyanates to furnish the corresponding thiosemicarbazides (4).Cyclisation of 4 in the presence of alkali furnishes the corresponding 2-(3′-mercapto-1′,2′,4′-triazol-5′-yl)-3-methoxybenzofurans (5).However, in presence of anhyd. orthophosphoric acid 4a-e yield 2-(5′-amino-1′,3′,4′-thiadiazol-2′-yl)-3-methoxybenzofurans (6a-e).Conversion of 3 into 3-methoxy-2-(1′,3′,4′-oxadiazol-2′-yl)-benzofuran (10) and its 5′-mercapto derivative (7) has also been carried out.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H3492O – PubChem