Trifluoroacetic acid → trans-Ethyl-1-benzyl-4-({[tertbutyl(dimethyl)silyl]oxy}methyl)pyrrolidine-3-carboxylate

Participants

Reaction Steps

To a solution of ethyl (2E)-4-{[tert-butyl(dimethyl)silyl]oxy}but-2-enoate (3.27 g, 13.4 mmol) and N-benzyl-1-methoxy-N-((trimethylsilyl)methyl)methanamine (4.14 g, 17.5 mmol) in CH2Cl2 (30 mL) was added TFA (0.280 mL, 3.64 mmol) at 0° C. The reaction was stirred at rt overnight. The mixture was quenched with water (50 mL) and extracted with EtOAc (two×50 mL). The combined organic layers were dried over MgSO4 and concentrated. The residue was purified via flash chromatography eluting with 20% EtOAc/heptane to give the title compound as a pale yellow oil (2.61 g, 53 yield). 1H NMR (400 MHz, chloroform-d) δ ppm 7.08-7.41 (m, 5H), 4.10 (q, J=7.13 Hz, 2H), 3.42-3.73 (m, 4H), 2.37-2.90 (m, 6H), 1.22 (t, J=7.05 Hz, 3H), 0.84 (s, 9H), 0.00 (d, J=1.26 Hz, 6H).

Provenance & Evidence