Sodium Hydroxide → (R)-3-(biphenyl-4-ylmethyl)-4-(2-carboxyethylamino)-4-oxobutanoic acid

Participants

Reaction Steps

To a solution of (R)-3-(biphenyl-4-ylmethyl)-4-(3-methoxy-3-oxopropylamino)-4-oxobutanoic acid (22.1 mg, 0.060 mmol) in THF (0.6 mL) and methanol (0.1 mL), aqueous 1M NaOH (0.12 mL, 0.12 mmol) is added at room temperature. After stirring for 3 hours, additional aqueous 1M NaOH (0.12 mL, 0.12 mmol) is added. The reaction mixture is allowed to stir for 30 minutes and quenched with 0.5 mL of aqueous 1M HCl and 0.5 mL of brine. The mixture is extracted twice with ethyl acetate, and the organic layer is concentrated under reduced pressure to give (R)-3-(biphenyl-4-ylmethyl)-4-(2-carboxyethylamino)-4-oxobutanoic acid (16.4 mg). HPLC retention time=1.04 minutes (condition A); MS (m+1)=356.1; 1H NMR (400 MHz, DMSO-d6) δ ppm 2.13-2.31 (m, 3 H) 2.59-2.65 (m, 1 H) 2.81-2.90 (m, 2 H) 3.12-3.27 (m, 2 H) 7.26 (d, 2 H, J=8 Hz) 7.34 (t, 1 H, J=7.4 Hz) 7.45 (t, 2 H, J=7.7 Hz) 7.57 (d, 2 H, J=8.1 Hz) 7.63-7.65.

Provenance & Evidence