反应详情

A mixture of 2-phenyl-5-ethyl-oxazole-4-carboxylic acid (180 mg, 0.829 mmol), 4-(4-amino-phenyl)-piperidine-1-carboxylic acid tert-butyl ester (218 mg, 0.79 mmol), triethylamine (467 mL, 3.316 mmol), and BOP (366 mg, 0.89 mmol) in 5 mL DMSO was stirred at room temperature for 1.0 hr. The reaction was taken up in EtOAc (50 mL) and washed with hydrochloric acid (0.1N, 20 mL), water (20 mL), saturated sodium bicarbonate solution (20 mL), and brine (20 mL). The organic layer was dried with anhydrous magnesium sulfate and filtered to give 4-{4-[(2-phenyl-5-ethyl-oxazole-4-carbonyl)-amino]-phenyl}-piperidine-1-carboxylic acid tert-butyl ester. ES-MS for C28H33N3O4 calcd. (m/e) 47.5, observed 476 (M−H).

1. washwashed with hydrochloric acid (0.1N, 20 mL), water (20 mL), saturated sodium bicarbonate solution (20 mL), and brine (20 mL)
2. dry with materialThe organic layer was dried with anhydrous magnesium sulfate
3. filtrationfiltered