2-Aminothiazole → 3-cyclopentyl-2-[4-(1-hydroxy-cyclohexylethynyl)-phenyl]-N-thiazol-2-yl-propionamide

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Reaction Steps

A solution of 3-cyclopentyl-2-[4-(1-hydroxy-cyclohexylethynyl)-phenyl]-propionic acid (170 mg, 0.50 mmol), benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (332 mg, 0.75 mmol), triethylamine (0.21 mL, 1.50 mmol) and 2-aminothiazole (86 mg, 0.75 mmol) in methylene chloride (5 mL) was stirred at 25° C. for 4 h. At this time, the reaction was diluted with methylene chloride (10 mL). This solution was washed with water (1×10 mL), a 1N aqueous sodium hydroxide solution (1×10 mL), a 1N aqueous hydrochloric acid solution (1×10 mL), and a half-saturated aqueous sodium chloride solution (1×10 mL). The aqueous layers were back extracted with methylene chloride (1×10 mL). The combined organic extracts were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-[4-(1-hydroxy-cyclohexylethynyl)-phenyl]-N-thiazol-2-yl-propionamide (123 mg, 58.3%) as a white solid: mp 172-173° C.; EI-HRMS m/e calcd for C25H30N2O2S (M+) 422.2028, found 422.2023.

Provenance & Evidence