tert-butyl N-(2-oxoethyl)carbamate → HCID 57657410, compound

Participants

Reaction Conditions

Reaction Steps

A solution of compound 12B (2.03 g, 8 mmol), (2-oxo-ethyl)-carbamic acid tert-butyl ester (1.27 g, 8 mmol) and NaBH(OAc)3 (1.70 g, 8 mmol) in DCM (30 ml) was maintained at ambient temperature overnight followed by the addition of NaBH(OAc)3 (3.39 g, 16 mmol). Reaction mixture was stirred at 50° C. for 3 hours, diluted with EtOAc (200 ml) and extracted with water (200 ml), 5% aq. bicarbonate (200 ml) and brine (200 ml). Organic layer was dried over anh. MgSO4 and evaporated in vacuum. Residue was dissolved in DMSO (5 ml) and subjected to HPLC purification. [Phenomenex Gemini C-18 column, 110 Å (30×100 mm); flow rate=45 ml/min; mobile phase A: 100% water, 0.1% TFA; mobile phase B: 100% ACN, 0.1% TFA; gradient elution from 25% B to 70% B in 70 min., detection 254 nm]. Fractions containing the desired product were combined and neutralized with 1 M NaOH. ACN was evaporated. Residual solution was extracted with EtOAc (2×100 ml). Organic layer was dried over anh. MgSO4 and evaporated in vacuum to provide target product (1.10 g, 35%) as light yellow oil. LC-MS [M+H] 397.2 (C19H32N4O3S+H, requires 397.56).

Provenance & Evidence