(-)-Asparagine → N-Phenysulfonyl-L-asparagine

Temperatur

0 °C

To a stirred solution of L-asparagine (Aldrich) (10 g, 76 mmol), NaOH (3.4 g, 85 mmol), H2O (50 mL), and dioxane (50 mL) at 0° C. was added PhSO2Cl (10.6 mL, 84 mmol). After 1 min, NaOH (3.4 g) in H2O (50 mL) was added and the reaction mixture stirred for 30 MIN. The reaction mixture was then concentrated to remove dioxane then washed with EtOAc. The aqueous phase was then cooled to 0° C. and acidified to pH 5.0 with conc. HCl to effect product precipitation. The resulting solid was collected by filtration, washed with H2O (20 mL) and dried at 50° C. under vacuum to give N-phenylsulfonyl-L-asparagine (2-1a) as a white solid.

1. concentrationThe reaction mixture was then concentrated
2. customto remove dioxane
3. washthen washed with EtOAc
4. customproduct precipitation
5. filtrationThe resulting solid was collected by filtration
6. washwashed with H2O (20 mL)
7. customdried at 50° C. under vacuum

ORD-Eintrag

ord-3edb8ad749e44a618e65b76d14d1e246

Quelldatensatz

uspto-grants-1999_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05929120