3-Fluoro-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-benzaldehyde → [Rac]-2-ethoxy-3-{3-fluoro-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-phenyl}-propionic acid

Participants

Reaction Steps

In analogy to the procedures described in examples 114 b], c] and d], 3-fluoro-4-hydroxy-benzaldehyde was reacted with methanesulfonic acid 2-(5-methyl-2-phenyl-oxazol-4-yl)-ethyl ester [PCT Int. Appl. (2000) WO0008002] to give 3-fluoro-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-benzaldehyde. Treatment of 3-fluoro-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-benzaldehyde with (benzyloxycarbonyl-ethoxy-methyl)-triphenyl-phosphonium chloride (prepared in analogy to the procedure described for the synthesis of (benzyloxycarbonyl-methoxy-methyl)-triphenyl-phosphonium chloride in example 114 a]) then gave 2(Z,E)-ethoxy-3-{3-fluoro-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-phenyl}-acrylic acid benzyl ester, which was hydrogenated to yield [rac]-2-ethoxy-3-{3-fluoro-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-phenyl}-propionic acid as colorless solid.

Provenance & Evidence