Hydrochloric Acid → (2S)-5-oxooxolane-2-carboxylic acid

To a solution of (S)-2-aminopentanedioic acid (100 g, 680 mmol) in H2O (500 mL) was added HCl (140 mL, 1.6 mol) and then NaNO2 (70.4 g, 1.02 mol) in H2O (100 mL) was added slowly at −5° C.-0° C., and the reaction mixture was stirred at room temperature for 24 hours. The solvent was concentrated in vacuo below 50° C. The residue was suspended in EtOAc (500 mL) and filtered. The filtrate was dried over Na2SO4 and concentrated in vacuo to afford 56 g crude product of (2S)-5-oxotetrahydrofuran-2-carboxylic acid (compound 28a) as yellow oil, which was used in next step without further purification.

1. concentrationThe solvent was concentrated in vacuo below 50° C
2. filtrationfiltered
3. dry with materialThe filtrate was dried over Na2SO4
4. concentrationconcentrated in vacuo

ORD-Eintrag

ord-7d6da0dadc8841038a667aa9079986f3

Quelldatensatz

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09441008B2