Sodium Hydroxide → (1S)-1-phenyl-2-(phenylamino)ethan-1-ol

Participants

Reaction Steps

To a solution of N-(2-phenyl-2-(S)-hydroxyethyl)-4-(2-aminoethyl)aniline trifluoroacetate 31 (0.144 g, 0.3 mmole) in methanol (10 mL) was added aq. NaOH solution (1.0 M, 0.625 mL). The solution was concentrated to dryness and the residue was dissolved in anhydrous THF (5 mL). α,α-Dihydroxy-4-hydroxy-3-methoxycarbonylacetophenone 12 (0.067 g, 0.3 mmole) was added and the reaction mixture was stirred for 12 h at rt. BH3-Me2S (0.2 mL, 2M) was added at 0° C. and the reaction mixture was heated at 75° C. for 6 h. After cooling the reaction mixture in ice bath, MeOH (5 mL) was slowly added to it to quench the reaction, and the reaction mixture was stirred for 30 min., at rt. The organics were removed and the residue was dissolved in TFA/MeOH (1/9; 20 mL), and concentrated. The crude product was dissolved in 20% MeCN/H2O, and purified by preparative HPLC: 5 to 20% MeCN/H2O; 20 mL/min; 254 nm.) to give 1-{2-[N-2-(4-hydroxy-3-hydroxy-methylphenyl)-2-hydroxyethyl]amino]ethyl}-4-[N-(2-phenyl-2-(S)-hydroxyethyl)-amino]benzene 33.

Provenance & Evidence