Sodium Hydroxide → (R)-4-(1-carboxy-3-(3'-chlorobiphenyl-4-yl)propan-2-ylamino)-4-oxobutanoic acid

Participants

Reaction Steps

To a solution of (R)-4-(1-(2′,5′-dichlorobiphenyl-4-yl)-4-ethoxy-4-oxobutan-2-ylamino)-4-oxobutanoic acid (Example 1-6: 106 mg, 0.234 mmol) in THF (2 ml) and MeOH (0.1 ml), 1M aqueous NaOH solution (1.406 mL, 1.406 mmol) is added at room temperature. After stirring for 4.5 hours, the reaction is quenched with 0.1 M aqueous HCl (3 ml), and the products are extracted with EtOAc. The combined organic layer is washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude is triturated in DCM. The precipitates are collected on a funnel, washed with DCM, and dried under reduced pressure to give (R)-4-(1-carboxy-3-(3′-chlorobiphenyl-4-yl)propan-2-ylamino)-4-oxobutanoic acid (64.0 mg) as white solid; HPLC retention time=1.24 minutes (condition A); MS (m+1)=424.07; 1H NMR (400 MHz, CD3OD) δ ppm 2.38-2.42 (m, 2 H) 2.45-2.57 (m, 4 H) 2.87 (A of ABX, Jab=13.6 Hz, Jax=7.6 Hz, 1 H) 2.95 (B of ABX, Jab=13.6 Hz, Jbx=6.1 Hz, 1 H) 4.44-4.51 (m, 1 H) 7.30-7.37 (m, 6 H) 7.47 (d, J=8.4 Hz, 1 H).

Provenance & Evidence