反应详情

To a solution of 2-ethyloxazole-5-carboxylic acid (95 mg, 0.68 mmol) in DMF (2 mL) and DCM (2 mL) is added (4S)-ethyl 4-amino-5-(3′-chlorobiphenyl-4-yl)-2-methylpentanoate hydrochloride (215 mg, 0.56 mmol), HATU (321 mg, 0.84 mmol), and TEA (392 μL, 2.81 mmol). After stirring for 2 hours, the reaction is quenched with H2O, and the crude is diluted with EtOAc, the organic layer is washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The obtained residue is purified by RP-HPLC (SunFire C18, H2O(0.1% TFA)/CH3CN) to give (4S)-ethyl 5-(3′-chlorobiphenyl-4-yl)-4-(2-ethyloxazole-5-carboxamido)-2-methylpentanoate (264 mg), HPLC retention time=0.71 minutes (condition B); MS (m+1)=469.3.

1. customthe reaction is quenched with H2O
2. additionthe crude is diluted with EtOAc
3. washthe organic layer is washed with brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe obtained residue is purified by RP-HPLC (SunFire C18, H2O(0.1% TFA)/CH3CN)