2-Aminothiazole → 2-biphenyl-4-yl-3-cyclopentyl-N-thiazol-2-yl-propionamide

Participants

Reaction Steps

A solution of 2-biphenyl-4-yl-3-cyclopentylpropionic acid (121.0 mg, 0.41 mmol), benzotriazol-1 -yloxytris(dimethylamino)phosphonium hexafluorophosphate (218.1 mg, 0.49 mmol), triethylamine (172 μL, 1.23 mmol), and 2-aminothiazole (45.3 mg, 0.45 mmol) in dry N,N-dimethylformamide (1 mL) was stirred at 25° C. under nitrogen for 24 h. The reaction mixture was concentrated in vacuo to remove N,N-dimethylformamide. The resulting residue was diluted with ethyl acetate (100 mL). The organic layer was washed with a 10% aqueous hydrochloric acid solution (1×100 mL), water (1×100 mL), and a saturated aqueous sodium chloride solution (1×100 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 to 3/1 hexanes/ethyl acetate gradient elution) afforded 2-biphenyl-4-yl-3-cyclopentyl-N-thiazol-2-yl-propionamide (102.2 mg, 66%) as a white solid: mp 194-195° C.; EI-HRMS m/e calcd for C23H24N2OS (M+) 376.1609, found 376.1612.

Provenance & Evidence