Diisopropylethylamine → (S)-benzyl 5-((2-(benzyloxy)-2-oxoethyl)amino)-2-((tert-butoxycarbonyl)amino)-5-oxopentanoate

Participants

Reaction Conditions

Reaction Steps

A solution of benzyl 2-aminoacetate hydrochloride (17.6 mg, 0.0871 mmol) and DIPEA (0.0152 ml, 0.0871 mmol) in DMF (0.0871 ml) was added to a solution of (S)-benzyl 2-((tert-butoxycarbonyl)amino)-5-((4-fluorophenyl)thio)-5-oxopentanoate (Compound 5e-2) (30.0 mg, 0.0670 mmol) in DMF (0.463 ml) and water (0.220 ml), and the mixture was stirred at 50° C. for six hours. The reaction mixture was then purified by reverse-phase silica gel column chromatography (10 mM aqueous ammonium acetate solution/methanol=70/30→20/80) to afford (S)-benzyl 5-((2-(benzyloxy)-2-oxoethyl)amino)-2-((tert-butoxycarbonyl)amino)-5-oxopentanoate (Compound 5d-2) (29.4 mg, 91%).

Provenance & Evidence