Benzyl Chloride → (1S,3R)-3-(dibenzylamino)cyclohexanol

Participants

Reaction Conditions

Reaction Steps

To a suspension of (1S,3R)-3-aminocyclohexanol (5 g, 43.4 mmol; prepared as described in Tetrahedron: Asymmetry 15: 2051-2056 (2004)) and sodium bicarbonate (12.03 g, 143 mmol) in ethanol (100 mL) was added (chloromethyl)benzene (15.01 mL, 130 mmol) at room temperature. The reaction mixture was heated at 75° C. overnight. Upon completion of reaction as indicated by LCMS and TLC the reaction mixture was filtered and the filtrate was concentrated. The residue was then dissolved in DCM (250 mL) and washed with aqueous sodium hydroxide solution (1 N, 2×100 mL) and brine (1×100 mL). The combined organic layers were dried over anhydrous magnesium sulfate, concentrated, and purified by silica gel chromatography (0%-80% ethyl acetate in hexanes) to yield (1S,3R)-3-(dibenzylamino)cyclohexanol (11.70 g, 91%) as a thick yellow oil. 1H NMR (400 MHz, DMSO-d6) δ ppm 7.26-7.37 (m, 8H), 7.17-7.22 (m, 2H), 4.56 (d, J=4.30 Hz, 1H), 3.57 (s, 4H), 3.16-3.26 (m, 1H), 2.41 (tt, J=3.17, 11.86 Hz, 1H), 1.99-2.06 (m, 1H), 1.72 (d, J=8.20 Hz, 2H), 1.63-1.69 (m, 1H), 1.18-1.28 (m, 2H), 0.98 (t, 2H); MS (ESI) m/z 296.4 [M+1]+.

Provenance & Evidence