Carbamic acid, ethyl ester → (R)-5-(Methoxymethyl)oxazolidin-2-one

Temperatur

140 °C

Urethane (37.4 g, 0.420 mmol) was dissolved in N,N-dimethylformamide (200 mL), and thereto were added cesium fluoride (5.80 g, 38.2 mmol) and (S)-4-methoxymethyl-1,3-dioxolan-2-one (50 g, 0.382 mol, optical purity 97.7%ee), in order. The mixture was stirred for 72 hours at 140° C. under an atmosphere of argon. After filtering off the insoluble materials, the filtrate was condensed in vacuo, and the residue was purified by distillation to give the subject (R)-5-methoxymethyloxazolidin-2-one (35.1 g, yield 69.6 %, optical purity 97.3%ee).

1. filtrationAfter filtering off the insoluble materials
2. customcondensed in vacuo
3. distillationthe residue was purified by distillation

ORD-Eintrag

ord-0c9cf11626ce4ed4be3fbc029e2feee6

Quelldatensatz

uspto-grants-2001_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06271388B1