Ammonium formate → (3R,4S)-3-({[tert-butyl(dimethyl)silyl]oxy}methyl)-4-phenylpyrrolidine

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Reaction Conditions

Reaction Steps

A mixture of 117 g (0.31 mol) of 1-benzyl-3-(R)-(tert-butyldimethylsilyloxymethyl)-4-(S)-phenyl pyrrolidine (from Step D), 31.5 g (0.50 mol) ammonium formate, 20.0 g of 20% palladium hydroxide on carbon in 1.5 L of MeOH was heated at 55° C. for 2.5 h. The mixture was cooled and filtered through a pad of Celite. The filtrate was concentrated. The residue was dissolved in 1 L of CH2Cl2, washed with 300 mL of 10% NH4OH solution, 200 mL of sat'd NaCl, dried over MgSO4 and concentrated to afford the title compound: 1H NMR (400 MHz) δ −0.09 (s, 3H), −0.08 (s, 3H), 0.77 (s, 9H), 2.25–2.30 (m, 1H), 2.84–2.96 (4H), 3.18 (dd, J=11.2, 3.2, 1H), 3.29–3.36 (m, 1H), 3.44 (dd, J=10.0, 6.0), 3.56 (dd, J=10.0, 4.4, 1H); ESI-MS 292 (M+H); HPLC A: 3.44 min.

Provenance & Evidence