反应详情

In analogy to the procedure described in example 120 f], 2-ethoxy-3-(4-hydroxy-benzofuran-7-yl)-propionic acid methyl ester (example 120 e]) was reacted with 4-chloromethyl-5-methyl-2-thiophen-2-yl-oxazole (prepared from thiophen-2-carbaldehyde and diacetyl monoxyme followed by treatment with POCl3 in analogy to the procedures described in examples 21 a] and b]) in the presence of potassium carbonate and potassium iodide to yield [rac]-2-ethoxy-3-[4-(5-methyl-2-thiophen-2-yl-oxazol-4-ylmethoxy)-benzofuran-7-yl]-propionic acid methyl ester, which was further saponified in analogy to the procedure described in example 120 f] to yield [rac]-2-ethoxy-3-[4-(5-methyl-2-thiophen-2-yl-oxazol-4-ylmethoxy)-benzofuran-7-yl]-propionic acid as white solid.