Dicyclohexylcarbodiimide → HCID 58993644, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of 1-(tert-butoxycarbonyl)-4-phenylpiperidine-4-carboxylic acid (3.8 g, 10.3 mmol) in a dichloromethane (5 mL) and toluene (30 mL) mixture was treated with 1,3-dicyclohexylcarbodiimide (2.96 g, 14.4 mmol) and stirred for 30 min. The suspension was cooled to 0° C. and treated with (R)-1-(3-bromo-5-(trifluoromethyl)phenyl)ethanol (2.79 g, 10.3 mmol) and dimethylaminopyridine (1.26 g, 10.3 mmol). The ice bath was removed and the suspension stirred at room temperature for 60 h. The reaction mixture was poured into pentane, filtered, and the solids washed several times with pentane. The filtrate was washed with 1 N hydrochloric acid (1×), water (2×), then 1 N sodium hydroxide, then brine (2×), dried over sodium sulfate, and concentrated. Flash chromatography on silica gel (12% ethyl acetate/hexanes) gave 4.8 g (84%) as a light yellow oil. 1H NMR (500 MHz, CDCl3) δ ppm 7.58 (s, 1H), 7.23-7.33 (m, 6H), 7.19 (s, 1H), 5.80 (q, J=6.6 Hz, 1H), 3.82-3.97 (m, 2H), 2.97-3.09 (m, 2H), 2.44-2.53 (m, 2H), 1.76-2.01 (m, 2H), 1.42 (s, 9H), 1.40 (m, 3H). Mass spec.: 558.06 (MH)+.

Provenance & Evidence