Pseudoephedrine → N-(1-Hydroxy-1-phenylprop-2-yl)-N-methyl-3-cyclohexylpropionamide

関与物質

反応手順

Thionyl chloride (3.5 mL, 48 mmol) was added to a solution of cyclohexanepropionic acid (5.5 mL, 32 mmol) in CH2Cl2 (60 mL). The mixture was heated at reflux for 60 min and then allowed to cool to ambient temperature and the solvent removed. The residue was redissolved in THF (50 mL) and (1R,2R) pseudoephedrine (4.8 g, 29 mmol) in THF (60 mL) was added to the reaction mixture at 0° C. After stirring for 30 min, a solution of saturated NaHCO3 was added to the mixture which was then extracted with EtOAc. The organic phase was dried (MgSO4) and concentrated. The residue was chromatographed (silica gel; EtOAc/hexanes 1:1) to afford an oil which solidified when placed in the refrigerator over night (8.2 g, 94%). MS (CI/NH3) m/z: 304 (M+H)+.

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