Diisopropylethylamine → (9H-fluoren-9-yl)methyl(S)-1-((S)-(1,1-diethoxypropan-2-yl)(benzyl)amino)-1-oxopropan-2-ylcarbamate

Beteiligte Stoffe

Reaktionsschritte

To a solution of (S)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)propanoic acid 68 mg (0.22 mmol) and O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate 84 mg (0.22 mmol) in dichloromethane 1 ml, a solution of (S)—N-benzyl-1,1-diethoxypropan-2-amine (Compound IV-15) 47 mg (0.2 mmol) and N,N′-diisopropylethylamine 38 ml (0.22 mmol) in dichloromethane 1 ml was added and the mixture was stirred at room temperature overnight. The reaction mixture was diluted with ethyl acetate 50 ml and washed with saturated aqueous sodium bicarbonate 50 ml, water 50 ml and brine 50 ml. The organic phase was dried over magnesium sulfate and filtered. The filtrate was concentrated in vacuo and the residue was purified on silica gel column chromatography (n-hexane:ethyl acetate=9:1 to 7:3) to obtain the title compound 48 mg (45%).

Herkunft & Nachweise