Potassium Hydroxide → 2-((tert-Butoxycarbonyl)amino)-3-ethoxy-3-oxopropanoic acid

Participants

Reaction Steps

To a solution of 1,3-diethyl 2-{[(tert-butoxy)carbonyl]amino}propanedioate XCVI (2.22 g, 8 mmol) in a mixture of ethanol/water (45 mL/5 mL) was added KOH (0.45 g, 8 mmol) in water (3 mL) dropwise. The reaction mixture was stirred for 1.5 hours. The ethanol was evaporated and the residue was acidified to pH=2 by 2 M HCl and washed by DCM. The organic layer was washed with brine and dried over MgSO4. The solvent was evaporated to give 2-{[(tert-butoxy)carbonyl]amino}-3-ethoxy-3-oxopropanoic acid XCVII as crystals (1.68 g, 6.8 mmol, 85% yield). 1H NMR (CDCl3) 1.31 (t, J=7 Hz, 3H), 1.41-1.45 (m, 9H), 4.23-4.31 9 m, 2H), 4.76 (d, J=4 Hz, 1H), 7.77 (d, J=4 Hz, 1H), 10.84 (brs, 1H); ESIMS found for C10H17NO6 m/z 248 (M+H).

Provenance & Evidence