反应详情

The same operation as in Example (102a) was performed using serine methyl ester hydrochloride (5.24 g, 33.7 mmol), 3-methyl-4-nitrobenzoic acid (6.1 g, 33.7 mmol), WSC hydrochloride (6.71 g, 35 mmol), DMAP (0.18 g, 1.5 mmol), N,N-diisopropylethylamine (4.52 g, 35 mmol) and dichloromethane (100 mL). The resulting residue was purified by silica gel column chromatography (elution solvent: ethyl acetate/hexane=1/4, 1/2, 2/1, 1/0) to obtain 8.35 g of the title compound as a light yellow solid (88%).

1. customThe resulting residue was purified by silica gel column chromatography (elution solvent: ethyl acetate/hexane=1/4, 1/2, 2/1, 1/0)