反应详情

The same operation as in Example (96a) was performed using methyl 5-methyl-2-(4-nitrophenyl)-4,5-dihydro-1,3-oxazole-4-carboxylate obtained in Example (97b) (1.1 g, 4.16 mmol), α,α-bisisobutyronitrile (33 mg, 0.2 mmol), N-bromosuccinimide (0.78 g, 4.37 mmol) and benzene (20 mL). Purification by silica gel column chromatography (elution solvent: ethyl acetate/hexane=1/4, 1/2, 1/1, 2/1) gave 0.75 g of the title compound as a light yellow solid (69%).

1. customPurification
2. washby silica gel column chromatography (elution solvent: ethyl acetate/hexane=1/4, 1/2, 1/1, 2/1)