Lithium Hydroxide → HCID 178438859, compound

Participants

Reaction Steps

3-Hydroxyisoxazole-5-carboxylic acid (15.8 mg, 122 μmol) was combined with HATU (46.6 mg, 122 μmol) in DMF (1.0 mL) and stirred for 5 minutes. DIPEA (53.3 μL, 0.306 mmol) was added, followed by (2S,4S)-4-amino-5-biphenyl-4-yl-2-hydroxymethyl-5-methylhexanoic acid ethyl ester (HCl salt; 40 mg, 0.1 mmol). The mixture was stirred at room temperature for 20 minutes. The reaction was quenched with water and extracted with EtOAc. The organic layer was concentrated and 1 M aqueous LiOH (1.0 mL, 1.0 mmol) and EtOH (2.0 mL) were added. The resulting mixture was stirred at room temperature for 2 hours. The reaction was quenched with AcOH and purified by preparative HPLC. The clean fractions were combined and lyophilized to yield the title compound (40 mg, 95% purity). MS m/z [M+H]+ calc'd for C24H26N2O6, 439.18. found 439.4.

Provenance & Evidence