4-tert-Butylcyclohexylamine → HCID 178468863, 화합물

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A mixture of ethyl 4-acetylbenzoate (3.00 g, 15.6 mmol), titanium (IV) isopropoxide (9.30 mL, 31.2 mmol), 4-tert-butylcyclohexyl amine (4.85 g, 31.2 mmol) in absolute ethanol (100 mL) was stirred under nitrogen at room temperature for 10 h. Sodium borohydride (0.88 g, 23.4 mmol) was then added and the resulting mixture was stirred for an additional 8 h at room temperature. The reaction was quenched by pouring into aqueous ammonia (2N, 225 mL). The resulting inorganic precipitate was filtered off and washed with dichloromethane (100 mL). The organic layer was separated and the remaining aqueous layer was extracted once with dichloromethane (100 mL). The combined organic extracts were dried over Na2SO4, filtered and concentrated. Chromatography (20% EtOAc in Hexane) afforded ethyl 4-{1-[(trans-4-tert-butylcyclohexyl)amino]ethyl}benzoate. HPLC/MS: m/z=332.3 (M+1), Rt=2.74 min. 1HNMR (500 MHz, CDCl3): δ 8.01 (2H, d, J=8.1 Hz), 7.38 (2H, d, J=8.0 Hz), 4.37 (2H, q, J=7.1 Hz), 4.02 (1H, q, J=6.6 Hz), 2.18-2.06 (2H, m), 1.77-1.67 (4H, m), 1.39 (3H, t, J=7.1 Hz), 1.32 (3H, d, J=6.5 Hz), 1.22 (1H, br s), 1.09-0.85 (4H, m), 0.79 (9H, s).

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