反应详情

N-(Methylphenylphosphinyl)-N-(2-phenylethyl)glycine methyl ester (300 mg, 0.905 mmol) is treated with 0.77 mL of NH2OK (1.76M in methanol, solution prepared as described in Fieser and Fieser, Vol. 1, p. 478). The mixture is stirred for 3 hours at room temperature, neutralized with formic acid and concentrated. The crude product is purified by silica gel flash chromatography (85:15 ethyl acetate:ethanol) giving the product with slight impurities. Preparative TLC (90:10 ethyl acetate:ethanol) gives N-hydroxy-2-[[methyl phenylphosphinyl](2-phenylethyl)-amino]-acetamide as a colorless solid: MS-IS m/z 333 [M+H]+, 350 [M+NH4 ]+, 355 [M+Na]+, 371 [M+K]+. (R1 =phenyl ethyl, R2 =H, R3 =methyl, R4 =phenyl).

1. concentrationconcentrated
2. customThe crude product is purified by silica gel flash chromatography (85:15 ethyl acetate:ethanol)
3. customgiving the product with slight impurities