Benzaldehyde → Methyl ((3S,4S)-1-benzyl-4-methylpiperidin-3-yl)carbamate

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The reductive amination of cis-(4-methyl-piperidin-3-yl)-carbamic acid methyl ester was carried out by charging 3.9 grams (1 equiv., 22.6 mmol) to 2.07 ml benzaldehyde (0.9 equiv., 20.4 mmol), 9.6 grams sodium triacetoxyborohydride (2 equivs., 45.3 mmol) and 39 ml methylene chloride (10 volumes). The reaction was stirred at 20° C. and was allowed to exotherm to 30°-35° C. The reaction was complete by GCMS within 30 minutes. The reaction was quenched with 78 ml saturated sodium bicarbonate (20 volumes), extracted into 78 ml methylene chloride (20 volumes) and concentrated to a clear oil. (70% yield). 1H NMR: δ7.2-7.3 (5 H, m, aromatic protons), 5.50-5.48 (1 H, d, J=8.8 Hz), 3.77-3.75 (1 H, d, J=8.0 Hz), 3.63 (3 H, s), 3.45-3.38 (2 H, m), 2.77-2.74 (2 H, d, J=11.2 Hz), 2.14-2.01 (1 H, m), 1.94-1.89 (1 H, m), 1.57-1.55 (1 H, brs), 1.37-1.20 (2 H, m), 0.876 (3 H, d, J=9.2 Hz).

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