Triphenylphosphine → (3-{3-[(2-Chloro-3-trifluoromethyl-benzyl)-diphenylethyl-amino]-propoxy}-phenyl)-carbamic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a stirring solution of N-(3-Hydroxy-phenyl)-carbamic acid tert-butyl ester (1.9 g, 9.0 mmol) in anhydrous toluene (60 mL) was added N-(2,2-diphenylethyl)-N-(3-hydroxy-propyl)-N-(2-chloro-3-trifluoromethyl-benzyl)amine (2.36 g, 5.3 mmol). Polymer bound triphenylphosphine (2.8 g, 8.4 mmol, 3 mmol/g, Fluka Chemie) was then added, and the mixture stirred for 15 minutes. The reaction mixture was then cooled to 0° C. and diisopropylazodicarboxylate (1.28 mL, 6.5 mmol) was added in a dropwise fashion. After stirring at room temperature for 60 hours, the crude reaction mixture was filtered and the resulting solid was washed with toluene. The filtrate was concentrated and the crude product was purified by silica gel chromatography (35 g Redisep column, silica, 40 um, 60 Å, 35 mL/min, A: hexanes, B: EtOAc, B: 0% for 5 min, B: 0% to 10% over 10 min; B: 10% for 10 min; B: 10% to 30% over 30 min; detection at 214 nm) to give 2.0 g (3.1 mmol, 59% yield) of the title compound as a white foam. MS (ESI) 639.4

Provenance & Evidence