Sodium Carbonate → (S)-chloromethyl 2-((tert-butoxycarbonyl)amino)propanoate

To a vigorously stirred mixture of (S)-2-((tert-butoxycarbonyl)amino) propanoic acid (1 g, 5.29 mmol), tetrabutylammonium hydrogen sulfate (0.359 g, 1.057 mmol), and Na2CO3 (2.80 g, 26.4 mmol) in DCM 20 (mL) and water (20 mL), cooled in an ice/water bath, was slowly added chloromethyl chlorosulfate (1.09 mL, 10.57 mmol) over a 4 min period. After stirring in an ice/water bath for 30 min, the cold bath was removed and the reaction mixture was allowed to stir at room temperature. After stirring 16 h at room temperature the reaction mixture was diluted with water and extracted with DCM. The aqueous layer was back extracted with DCM and the combined organic layers were dried over MgSO4, filtered and concentrated. The crude material (1.64 g) was used as is without further purification.

1. temperaturecooled in an ice/water bath
2. customover a 4 min
3. customthe cold bath was removed
4. stirringto stir at room temperature
5. stirringAfter stirring 16 h at room temperature the reaction mixture
6. additionwas diluted with water
7. extractionextracted with DCM
8. extractionThe aqueous layer was back extracted with DCM
9. dry with materialthe combined organic layers were dried over MgSO4
10. filtrationfiltered
11. concentrationconcentrated
12. customas is without further purification

ORD record

ord-e508b37085ae4b459d56473779b59086

Source dataset

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09273014B2