DL-alanine → HCID 21973204, compound

Temperature

0 °C

24.5 g (0.275 mol) of D,L-alanine are initially charged in 250 ml of dichloromethane, and 61.2 g (0.605 mol) of triethylamine are added. The mixture is cooled to 0° C., and 65.7 g (0.605 mol) of trimethylsilyl chloride are added. The mixture is stirred at room temperature for one hour and at 40° C. for one hour. The mixture is cooled to −10° C., and 37 g (0.275 mol) of 2-ethylbutyryl chloride are slowly added dropwise. The mixture is stirred at −10° C. for two hours and at room temperature overnight. The mixture is cooled in an ice bath, and 150 ml of water are added. 50 g (1.25 mol) of NaOH, dissolved in 100 ml of water, are added and the aqueous phase is separated off and concentrated. The residue is again taken up in water and acidified with concentrated hydrochloric acid, the aqueous solution is extracted repeatedly with dichloromethane and the organic phase is dried over Na2SO4 and concentrated.

1. temperatureThe mixture is cooled to −10° C.
2. stirringThe mixture is stirred at −10° C. for two hours and at room temperature overnight
3. temperatureThe mixture is cooled in an ice bath
4. additionare added
5. customthe aqueous phase is separated off
6. concentrationconcentrated
7. extractionthe aqueous solution is extracted repeatedly with dichloromethane
8. dry with materialthe organic phase is dried over Na2SO4
9. concentrationconcentrated

ORD record

ord-c36d552991a24f71914b9b7f80c81318

Source dataset

uspto-grants-2005_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06878708B2