Triphenylphosphine → [Rac]-2-ethoxy-3-(3-fluoro-4-{2-[2-(4-trifluoromethyl-phenyl)-thiazol-4-yl]-ethoxy}-phenyl)-propionic acid ethyl ester

Beteiligte Stoffe

Reaktionsschritte

In analogy to the procedure described in example 1 d], [rac]-2-ethoxy-3-(3-fluoro-4-hydroxy-phenyl)-propionic acid ethyl ester (example 7 a]) was reacted with 2-[2-(4-trifluoromethyl-phenyl)-thiazol-4-yl]-ethanol (prepared from 4-chloromethyl-2-(4-trifluoromethyl-phenyl)-thiazole (example 18 a] and 4 a]) in analogy to the sequence described in examples 13 a] to 13 d]) in tetrahydrofuran in the presence of triphenylphosphine and DEAD (diethyl azodicarboxylate) to yield [rac]-2-ethoxy-3-(3-fluoro-4-{2-[2-(4-trifluoromethyl-phenyl)-thiazol-4-yl]-ethoxy}-phenyl)-propionic acid ethyl ester, which was further saponified in analogy to the procedure described in example 4 e], to yield [rac]-2-ethoxy-3-(3-fluoro-4-{2-[2-(4-trifluoromethyl-phenyl)-thiazol-4-yl]-ethoxy}-phenyl)-propionic acid as a colorless gum.

Herkunft & Nachweise