Water → HCID 57714154, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a stirred solution of (R)-2-(trityl-amino)-butyraldehyde (1.5 g, 1 eq, 4.53 mmol) in Et2O (150 mL) under an argon atmosphere at −78° C., was added ethylmagnesium bromide (3 M in Et2O, 1.51 mL, 1 eq, 4.53 mmol) dropwise. The solution was stirred at −78° C. for 2 h, then allowed to warm to room temperature over 16 h. The mixture was recooled to 0° C., H2O (150 mL) added, and the organic phase separated. The aqueous phase was extracted with more Et2O (2×50 mL), and the combined organic phase washed with brine (50 mL), dried (MgSO4) and evaporated in vacuo. The residue was purified by silica gel column chromatography, eluted with hexane:ether (90:10) to afford the title compound as a light yellow oil. Yield: 1.13 g (69%). (57% de 3S,4R: 43% de 3R,4R). 1H-NMR (d6-DMSO, 250 MHz): δ 0.45 & 0.69 (t & m, 6H, J=7.43 Hz, —NHCH(CH2CH3)CH(CH2CH3)OH), 1.12-1.29 (m, 4H, —NHCH(CH2CH3)CH (CH2CH3)OH), 2.16 (m, 1H, —NHCH(CH2CH3)CH(CH2CH3)OH), 2.54 (m, 1H, —NHCH(CH2CH3)CH(CH2CH3)OH), 3.21-3.40 (m, 1H, —NHCH(CH2CH3)CH(CH2CH3)OH), 4.29+4.39 (2×d, 1H, J=4.42 & 5.37 Hz, —NHCH(CH2CH3)CH (CH2CH3)OH), 7.15-7.52 (m, 15H, 3×Ph).

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