Methanol → 2-(4-methanesulfonyl-phenyl)-3-[2-(tetrahydropyran-2-yloxy)-cyclopentyl]-N-thiazol-2-yl-propionamide

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2-Aminothiazole (314.3 mg, 3.14 mmol) and 2-(4-methanesulfonyl-phenyl)-3-[2-(tetrahydropyran-2-yloxy)-cyclopentyl]-propionic acid methyl ester (859.2 g, 2.09 mmol) were treated with a solution of magnesium methoxide in methanol (7.4 wt. %, 12 mL, 8.37 mmol). The resulting reaction mixture was heated under reflux for 24 h. The reaction mixture was allowed to cool to 25° C. and then filtered through a pad of celite. The pad of celite was washed well with ethyl acetate until the washings indicated the absence of product by thin layer chromatography. The filtrate was then washed with a 10% aqueous hydrochloric acid solution (3×100 mL). The organic layer was then dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70–230 mesh, 1/1 hexanes/ethyl acetate) afforded 2-(4-methanesulfonyl-phenyl)-3-[2-(tetrahydropyran-2-yloxy)-cyclopentyl]-N-thiazol-2-yl-propionamide (377.4 mg, 38%) as a yellow oil: EI-HRMS m/e calcd for C23H30N2O5S2 (M+) 478.1596, found 478.1604.

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