反应详情

温度

60 °C

Charge benzyl 2-(isobutylcarbamoylamino)acetate (200 g; 98.1% assay), dry Pd/C (20 g; 10% w/w), and isopropyl alcohol (2000 ml) into an autoclave. Degas under vacuum and purge with hydrogen three times. Stir at 60° C. under 50-60 psi of H2 for 4 hours. Cool the mixture to 20-30° C. and filter through diatomaceous earth and concentrate the filtrate under reduced pressure at 45-50° C. to 1-2Vol. Add acetonitrile (1000 ml) and concentrate under reduced pressure at 45-50° C. to 2-3 Vol. Cool the mixture to 5-10 C ° C. and filter. Dry the cake under reduced pressure at 45-50° C. to give of 2-(isobutylcarbamoylamino)acetic acid (112 g; 95.2% assay; 82.5% yield).

1. customDegas under vacuum
2. custompurge with hydrogen three times
3. temperatureCool the mixture to 20-30° C.
4. filtrationfilter through diatomaceous earth
5. concentrationconcentrate the filtrate under reduced pressure at 45-50° C. to 1-2Vol
6. concentrationAdd acetonitrile (1000 ml) and concentrate under reduced pressure at 45-50° C. to 2-3 Vol.
7. temperatureCool the mixture to 5-10 C ° C
8. filtrationand filter
9. customDry the cake under reduced pressure at 45-50° C.