Thionyl Chloride → Ethyl 2-[(7-{[(4-chloro-5-ethyl-1H-imidazol-2-yl)carbonyl]amino}-2,3-dihydro-4H-1,4-benzoxazin-4-yl)methyl]benzoate

Participants

Reaction Steps

The same operation as in Example (91c) was performed using 4-chloro-5-ethyl-1H-imidazole-2-carboxylic acid (0.14 g, 0.8 mmol), thionyl chloride (3 mL), ethyl 2-[(7-amino-2,3-dihydro-4H-1,4-benzoxazin-4-yl)methyl]benzoate obtained in Example (104b) (0.35 g, 1.12 mmol) and pyridine (5 mL). The resulting residue was purified by silica gel column chromatography (elution solvent: ethyl acetate/hexane=1/3, 2/3, 3/2, 3/1) to obtain 0.29 g of the title compound as a yellow solid (77%).

Provenance & Evidence