反应详情

A mixture of (2S)-{4-[4-(1,3-dioxo-1,3-dihydroisoindol-2-yl)butyl]-benzenesulfonylamino}-3-methylbutyramide 14 (0.40 g, 0.87 mmol) and methylamine (2 M in methanol, 20 mL, 40 mmol) was stirred at room temperature overnight. Solvent was removed by rotary evaporation and the residue was purified by flash silica gel column chromatography eluting with chloroform/methanol/concentrated ammonium hydroxide (3:1:0.1, v/v) to give (2S)-[4-(4-aminobutyl)benzenesulfonylamino]-3-methyl-butyramide (15) as a white powder (156 mg, 54% yield). 1H NMR (300 MHz, CD3OD) δ 0.85 (d, 3H), 0.87 (d, 3H), 1.66 (m, 4H), 1.90 (m, 1H), 2.69 (m, 4H), 3.51 (d, 1H), 7.35 (d, 2H) 7.75 (d, 2H). m/z (ESI): 328 [C15H25N3O3S+H]+.

1. customSolvent was removed by rotary evaporation
2. customthe residue was purified by flash silica gel column chromatography
3. washeluting with chloroform/methanol/concentrated ammonium hydroxide (3:1:0.1