On March 31, 1991, Suzuki, Tsuneo published an article.Electric Literature of 53724-96-2 The title of the article was The reaction of ethyl 2-acetyl-5-methoxyphenoxyacetate with some bases in various solvents. And the article contained the following:
The reaction of the title compound (I) with KOH, NaOH, KOCMe3, EtONa, NaH, or NaNH2 in dioxane, THF, DMF, Me2SO, MeOH, EtOH, or Me3COH was reported. E.g., reaction of I with KOH in dioxane gave 19% benzofuran II, 44% benzofuran III, and 25% benzoxepin III. The experimental process involved the reaction of Ethyl 6-methoxy-3-methylbenzofuran-2-carboxylate(cas: 53724-96-2).Electric Literature of 53724-96-2
The Article related to acetylmethoxyphenoxyacetate cyclization solvent effect, Heterocyclic Compounds (One Hetero Atom): Areno- and Diarenofurans and other aspects.Electric Literature of 53724-96-2
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem