反应详情

The 2-(tert-butoxycarbonylamino)-3-(3-hydroxyphenyl)propanoic acid (0.89 g, 3.1 mol) was treated with N,N,N′,N′-tetramethyl-O-(7-azabenzotriazol-1-yl)uronium hexafluorophosphate (1.8 g, 4.6 mmol), N,N-diisopropylethylamine (1.6 mL, 9.3 mmol) and 2 M dimethylamine in THF (3.0 mL, 6.0 mmol), in N,N-dimethylformamide (20 mL) at r.t. The reaction was complete after stirring for 2 h. This was taken up in ethyl acetate and washed with 1 N HCl, brine, dried over magnesium sulfate and concentrated under reduced pressure to give the crude product as an oily residue. The product was purified by flash chromatography on a silica gel column eluting hexane: ethyl acetate gradient to give tert-butyl 1-(dimethylamino)-3-(3-hydroxyphenyl)-1-oxopropan-2-ylcarbamate (0.75 g, 78%) as an off white solid. Analytical LCMS (M+H-Boc)+: m/z=208.9.

1. washwashed with 1 N HCl, brine
2. dry with materialdried over magnesium sulfate
3. concentrationconcentrated under reduced pressure
4. customto give the crude product as an oily residue
5. customThe product was purified by flash chromatography on a silica gel column
6. washeluting hexane