Triethylamine → HCID 57947489, compound

Participants

Reaction Steps

To a mixture of (S)-2-((benzyloxycarbonyl)(methyl)amino)-4-tert-butoxy-4-oxobutanoic acid dicyclohexylammonium salt (20 g, 0.0386 mol) and Et3N (7.90 mL, 0.0579 mol) in THF (500 mL) was added isobutyl chloroformate (6.05 mL, 0.0463 mol) at 0° C. The reaction mixture was stirred for 1 h, and filtered to remove TEA salt. To the filtrate was added a solution of NaBH4 (2.19 g, 0.0579 mol) in THF (50 mL) and water (100 mL) at 0-5° C. The reaction mixture was stirred at RT for 1 h and quenched with saturated NH4Cl solution. The reaction mixture was concentrated to remove most of THF and extracted with EtOAc (700 mL×3). The organic layers were washed with water, NaHCO3 and brine, dried over Na2SO4, and concentrated to give (S)-tert-butyl 3-((benzyloxycarbonyl)(methyl)amino)-4-hydroxybutanoate (10 g), which was used without further purification. LRMS (M+Na+) m/z 346.1.

Provenance & Evidence