反应详情

In analogy to the procedure described in example 108 c], [rac]-2-ethoxy-3-(4-hydroxy-3-methyl-phenyl)-propionic acid ethyl ester [PCT Int. Appl. (2001), WO01/40172A1] was treated with 4-chloromethyl-2-phenyl-oxazole [prepared from benzamide and 1,3-dichloroacetone as described in Bioorg. Med. Chem. Lett. (2000), 10(17), 2041-2044] and sodium hydride in N,N-dimethylformamide to yield [rac]-2-ethoxy-3-[3-methyl-4-(2-phenyl-oxazol-4-ylmethoxy)-phenyl]-propionic acid ethyl ester, which was further saponified in analogy to the procedure described in example 91 e] to yield [rac]-2-ethoxy-3-[3-methyl-4-(2-phenyl-oxazol-4-ylmethoxy) -phenyl]-propionic acid as colorless gum.