Benzaldehyde → methyl (2R)-2-(benzylamino)propanoate

To a solution of D-alanine methyl ester hydrochloride (3.0 g, 21.5 mmol) in methanol (10 mL) is added benzaldehyde (2.3 mL, 22.6 mmol). The reaction mixture is stirred at room temperature for 3 hours. The solvent is then evaporated. To the resultant residue is added acetic acid (15 mL) and methanol (1 mL) followed by portionwise addition of sodium cyanoborohydride (1.35 g, 21.5 mmol) at room temperature. The mixture is stirred overnight, and then the solvent is evaporated. The remaining residue is diluted with water (75 mL) and basified with Na2CO3. The mixture is extracted with ethyl acetate (3×75 mL). The combined organic extracts are washed with brine (50 mL), dried (Na2SO4), and the solvent is evaporated to give N-benzyl-D-alanine methyl ester.

1. customThe solvent is then evaporated
2. additionTo the resultant residue is added acetic acid (15 mL) and methanol (1 mL)
3. stirringThe mixture is stirred overnight
4. customthe solvent is evaporated
5. additionThe remaining residue is diluted with water (75 mL)
6. extractionThe mixture is extracted with ethyl acetate (3×75 mL)
7. washThe combined organic extracts are washed with brine (50 mL)
8. dry with materialdried (Na2SO4)
9. customthe solvent is evaporated

ORD-Eintrag

ord-1e2135e7b33748c5989125d07bdcebe3

Quelldatensatz

uspto-grants-1997_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05646167