Triphenylphosphine → (1R)-N-(4-chloro-3-(1-(pyridin-2-yl)ethoxy)benzyl)-1-(3-chlorophenyl)ethanamine

Participants

Reaction Conditions

Reaction Steps

To a solution of (R)-2-chloro-5-((1-(3-chlorophenyl)ethylamino)methyl)phenol 96 (130 mg, 439 μmol) in 5 mL of THF under N2 was added triphenylphosphine (127 mg, 483 μmol). The solution was chilled to 0° C. in an ice bath and then diisopropyl azodicarboxylate (94 μL, 483 μmol) was added dropwise to the reaction. After stirring for 15 min 0° C., a solution of 1-(pyridin-2-yl)ethanol (59 mg, 483 μmol) in THF was added to the reaction. The reaction was allowed to warm to room temperature and it was stirred for 10 h. The reaction was concentrated and diluted with EtOAc. The solution was extracted with saturated NaHCO3, water, and then brine. The organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The crude material was purified by silica gel chromatography using a 5% to 90% gradient of EtOAc in hexanes as the eluant. The desired fractions were combined and concentrated to give (1R)—N-(4-chloro-3-(1-(pyridin-2-yl)ethoxy)benzyl)-1-(3-chlorophenyl)ethanamine 98 (67 mg, 38% yield) as a colorless oil and as a mixture of diastereomers. 1H NMR (400 MHz, d4-methanol) δ ppm 1.60 (d, J=6.65 Hz, 2.1H) 1.73 (d, J=5.28 Hz, 3H) 1.83 (d, J=6.46 Hz, 3H) 3.90 (d, J=11.15 Hz, 1H) 4.16 (d, J=12.72 Hz, 1H) 4.45-4.54 (m, 1H) 5.18-5.28 (m, 0.7H) 5.99 (m, 1H) 7.05 (d, 1H) 7.48 (m, 5H) 7.63 (m, 1H) 7.99 (m, 1.7H) 8.08 (m, 0.7H) 8.20 (d, 1H) 8.59 (m, 1.7H) 8.73 (m, 0.7H) 8.83 (d, 1H). Mass spectrum: calculated for C22H22Cl2N2O 401.3. found 402.4 (M++1).

Provenance & Evidence