反应详情

0.24 g (0.49 mmol) of 4-[2-(N′-{3-[5-(4-Methoxy-phenyl)-oxazol-2-yl]-benzoyl}-hydrazino)-2-oxo-ethyl]-benzoic acid methyl ester from Preparation 8 was dissolved in about 10 mL of poly phosphoric acid. The mixture was stirred at 90–100° C. for 1 hour before allowing to cool to room temperature. Water was added and the product was extracted with 1:1:1 EtOAC/THF/Et2O (2×). The extracts were combined and washed with saturated aqueous NaCl solution then dried MgSO4. Slurried solid product in hot EtOAc and filtered. Dried in vacuum oven overnight at 70° C. to obtain 0.13 g (57%) desired product.

1. extractionthe product was extracted with 1:1:1 EtOAC/THF/Et2O (2×)
2. washwashed with saturated aqueous NaCl solution
3. filtrationSlurried solid product in hot EtOAc and filtered
4. customDried in vacuum oven overnight at 70° C.