Benzyl Bromide → Diethyl 2-benzyl-2-(tert-butoxycarbonylamino)malonate

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To diethyl[(tert-butoxycarbonyl)amino]propanedioate (5.56 mL, 21.79 mmol) in ethanol (30 ml) was added sodium ethoxide (9.76 ml, 26.2 mmol) followed by benzyl bromide (2.59 mL, 21.79 mmol). The mixture was stirred for 6 h, and the solvent was removed in vacuo. Saturated aqueous sodium hydrogen carbonate (50 mL) was added and the mixture was extracted with ethyl acetate (3×50 mL). The combined organic fractions were washed with saturated aqueous brine (1×50 mL), dried with anhydrous sodium sulfate, filtered and the solvent removed in vacuo to afford the title compound as a colorless amorphous solid. LC/MS 366.1 (M+1).

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