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0 °C

To a solution of (S)-methyl 2-((4-methoxybenzyl)amino)-2-phenylacetate (1.6 g, 5.61 mmol) in anhydrous dichloroethane (20 mL) was added 4-methoxy benzaldehyde (0.76 g, 5.61 mmol) and few drops of HOAc. After 30 min, the reaction mixture was cooled to 0° C., sodium triacetoxy borohydride (2.38 g, 11.22 mmol) was added and the contents were allowed to stir at ambient temperature. After 2 h, the reaction was quenched with ice cold H2O (10 mL), and the organic contents were extracted with CH2Cl2 (2×25 mL). The combined organic extracts were washed with brine (1×20 mL), dried over Na2SO4, concentrated and the residue thus obtained was purified by flash column chromatography to afford (S)-methyl 2-(bis(4-methoxybenzyl)amino)-2-phenylacetate as pale yellow liquid (1.5 g, 66%). MS: [M+H]+ m/z 406.

1. waitAfter 2 h
2. customthe reaction was quenched with ice cold H2O (10 mL)
3. extractionthe organic contents were extracted with CH2Cl2 (2×25 mL)
4. washThe combined organic extracts were washed with brine (1×20 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. customthe residue thus obtained
8. customwas purified by flash column chromatography