(+)-Benzylphenethylamine → 3-[Benzyl-(1(R)-phenylethyl)-amino]-3-(2-fluoro-biphenyl-4-yl)-propionic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

A cooled (0° C.) solution of N-benzyl-(R)-α-methylbenzylamine (8.9 mL, 42.6 mmol) in THF (100 mL) was treated with n-butyllithium (26.6 mL of a 1.6 M soln in hexanes; 42.6 mmol). After stirring for 10 min, the purple solution was cooled to −78° C. and treated with a solution of ester 13-2 (5.76 g, 21.3 mmol) in THF (10 mL). After stirring for 20 min, the solution was quenched with satd aq NH4Cl soln (5 mL), and the cold bath removed. The reaction mixture was diluted with Et2O (100 mL), and washed with 10% aq citric acid (50 mL), satd aq NaHCO3 (50 mL), 5% aq acetic acid (30 mL), 10% aq K2CO3 (50 mL), and brine (50 mL). The solution was dried over MgSO4, filtered and concentrated. The residue was purified by flash chromatography (90:10 hexanes/EtOAc) to give adduct 13-3.

Provenance & Evidence