反应详情

The same operation as in Example (102a) was performed using threonine methyl ester hydrochloride (6.73 g, 39.6 mmol), 3-methyl-4-nitrobenzoic acid (7.18 g, 3.96 mmol), WSC hydrochloride (8.05 g, 42 mmol), DMAP (0.18 g, 1.5 mmol), N,N-diisopropylethylamine (5.42 g, 42 mmol) and dichloromethane (100 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 10.56 g of the title compound as a light yellow amorphous solid (90%).

1. customThe resulting residue was purified by silica gel column chromatography (elution solvent: ethyl acetate/hexane=1/3, 2/3, 3/2, 3/1)