Methanol → Ethyl N-(methoxycarbonyl)glycinate

Alternatively, glycine ethyl ester hydrochloride (40.1 g, 0.28 mole) suspended in dry tetrahydrofuran (200 ml) and phosgene were bubbled through the reaction mixture for 0.5 hrs, as the reaction mixture was refluxed. At the end of 0.5 hrs., the reaction was cooled to room temperature and toluene was added followed by the distillation of THF. The reaction mixture containing toluene was further refluxed for 1 hr. The unreacted glycine ethyl ester hydrochloride was filtered and the filtrate containing glycine ethyl ester isocyanate (IR 2250 cm-1) was reacted with excess (2-3 mole) anhydrous methanol and, when the isocyanate peak disappeared, the solvent was removed to isolate N-carbomethoxyglycine ethyl ester.

1. customphosgene were bubbled through the reaction mixture for 0.5 hrs, as the reaction mixture
2. temperaturewas refluxed
3. customAt the end of 0.5 hrs
4. additiontoluene was added
5. distillationfollowed by the distillation of THF
6. additionThe reaction mixture containing toluene
7. temperaturewas further refluxed for 1 hr
8. filtrationThe unreacted glycine ethyl ester hydrochloride was filtered
9. additionthe filtrate containing glycine ethyl ester isocyanate (IR 2250 cm-1)
10. customthe solvent was removed

ORD record

ord-c2e26164a4814f2490e474bd28d0bc9a

Source dataset

uspto-grants-1985_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04491548