Cesium carbonate → [Rac]-2-ethoxy-3-{4-[2-(4-trifluoromethyl-phenyl)-thiazol-5-ylmethoxy]-5,6,7,8-tetrahydro-naphthalen-1-yl}-propionic acid methyl ester

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Reaction Steps

In analogy to the procedure described in 14 b], [rac]-2-ethoxy-3-(4-hydroxy-5,6,7,8-tetrahydro-naphthalen-1-yl)-propionic acid methyl ester (example 2 c]) was reacted with 5-chloromethyl-2-(4-trifluoromethyl-phenyl)-thiazole (prepared from [2-(4-trifluoromethyl-phenyl)-thiazol-5-yl]-methanol [PCT Int. Appl. (2002), WO 02/62774 A1] and methanesulfonyl chloride, triethylamine in dichloromethane) in N,N-dimethylformamide in the presence of cesium carbonate to give [rac]-2-ethoxy-3-{4-[2-(4-trifluoromethyl-phenyl)-thiazol-5-ylmethoxy]-5,6,7,8-tetrahydro-naphthalen-1-yl}-propionic acid methyl ester, which was further saponified in analogy to the procedure described in example 1 e], to yield [rac]-2-ethoxy-3-{4-[2-(4-trifluoromethyl-phenyl)-thiazol-5-ylmethoxy]-5,6,7,8-tetrahydro-naphthalen-1-yl}-propionic acid as light yellow solid.

Provenance & Evidence