Thionyl Chloride → HCID 86596721, compound

To methyl (S)-4-amino-2-hydroxybutyrate hydrochloride (521.6 mg; 409.5 mg when calculated as methyl (S)-4-amino-2-hydroxybutyrate) was added 1.8 mL of thionyl chloride. The mixture was stirred at room temperature for 3 hours and then at 50° C. for 4 hours. Thereafter, the solvent was distilled off under reduced pressure to give 576.2 mg of methyl (R)-4-amino-2-chlorobutyrate hydrochloride (yield quantitative, optical purity 96.9% ee). The analysis of the optical purity was carried out by derivatizing into (R)-3-chloro-2-pyrrolidinone with sodium hydrogen carbonate, followed by high performance liquid chromatography using a chiral column (Chiralcel OB-H (Daicel)).

1. waitat 50° C. for 4 hours
2. distillationThereafter, the solvent was distilled off under reduced pressure

ORD record

ord-2fbc30a569db420ebee64a27e0dc9863

Source dataset

uspto-grants-2005_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06838567B1